Unable to upgrade Python 3.8.10 to 3.10 - SOLVED

Hi,

I tried to upgrade Python 3.8.10 to 3.10 on Ubuntu :

Ubuntu 20.04.4 LTS

but we hit a blocker and wondering whether anyone is able to upgrade it successfully. We basically followed the following page for instructions:

When we reached 2nd command in Step 3: Add Python 3.8 & Python 3.10 to update-alternatives, we see this error.

$ sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.10 2
update-alternatives: error: alternative path /usr/bin/python3.10 doesn't exist

we created

/usr/bin/python3.10

directory manually as per the above prompted error but that does not help. So I ended up here and see if anyone can help us.

Best regards,
~Ram

Hi and welcome.

Not that I can answer your question, but I’ll share my tail of woe:

I’m running Mint and tried to force up-grade P3.6 to P3.8. I followed a very nice guide and it all seemed to be good, until I had to reboot my system; disaster!!

Because I use ‘Timeshift’ and have a five day history, and (as luck would have it) I needed to reboot, I was able to restore my system.

I was lucky, because I seldom turn my computer off and only reboot every once in a while; sometimes 6 to 8 weeks, or even longer.

So be careful and make sure that you can recover, if it all falls apart.

Never update your operating system’s Python installation unless the OS itself wants you to :slight_smile:

If you want to run a more recent Python, you should install it from scratch as an independent installation, and then use that.

If you know how to use the command line on Linux, it’s not too hard. If you’ve never done it before there are a few hints I can give you, because there are some traps for the unwary and subtleties, but otherwise it is mostly straightforward.

Here is the current status of Python on my Ubuntu droplet from Digital ocean:.

$ python3 -V
Python 3.8.10
$ 
$ 
$ apt list | grep python3.10

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

libqgispython3.10.4/focal,now 3.10.4+dfsg-1ubuntu2 amd64 [installed]
$ 
$ sudo update-alternatives --config python3
There is 1 choice for the alternative python3 (providing /usr/bin/python3).

  Selection    Path                Priority   Status
------------------------------------------------------------
  0            /usr/bin/python3.8   1         auto mode
* 1            /usr/bin/python3.8   1         manual mode

Press <enter> to keep the current choice[*], or type selection number: 
$ 
$ 
$ ls -lrt /usr/bin/ | grep python
lrwxrwxrwx 1 root   root          33 Mar 13  2020 x86_64-linux-gnu-python3-config -> x86_64-linux-gnu-python3.8-config
lrwxrwxrwx 1 root   root          16 Mar 13  2020 python3-config -> python3.8-config
lrwxrwxrwx 1 root   root          31 Mar 13  2020 py3versions -> ../share/python3/py3versions.py
-rwxr-xr-x 1 root   root        3241 Mar 15 12:22 x86_64-linux-gnu-python3.8-config
lrwxrwxrwx 1 root   root          33 Mar 15 12:22 python3.8-config -> x86_64-linux-gnu-python3.8-config
-rwxr-xr-x 1 root   root     5490448 Mar 15 12:22 python3.8
lrwxrwxrwx 1 root   root          23 Mar 15 12:22 pdb3.8 -> ../lib/python3.8/pdb.py
lrwxrwxrwx 1 root   root          25 May 10 04:37 python3 -> /etc/alternatives/python3
$

If you notice in the result, there is no Python3.10 executable though it was installed. If it is there I could have add it into alternatives.

$ sudo apt-get install python3.10
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'libqgispython3.10.4' for regex 'python3.10'
Note, selecting 'libpython3.10-stdlib' for regex 'python3.10'
libqgispython3.10.4 is already the newest version (3.10.4+dfsg-1ubuntu2).
0 upgraded, 0 newly installed, 0 to remove and 19 not upgraded.
$

Please let me know if you get any idea from the current status.

Thanks,
~Ram

Thank you.

Rather than hijack the OP’s thread, I’ll start a new one as and when – I’ve a couple of pressing issues that have come to light and I need to address those before I get to this.

I was able to solve this issue by running the following steps:

Step 1: Current state of the Python version:

$ python3 -V
Python 3.8.10
$ ls /usr/bin | grep python
python3
python3-config
python3.8
python3.8-config
x86_64-linux-gnu-python3-config
x86_64-linux-gnu-python3.8-config
$

Step 2: Current state of Python alternatives:

$ sudo update-alternatives --config python3
There is 1 choice for the alternative python3 (providing /usr/bin/python3).

  Selection    Path                Priority   Status
------------------------------------------------------------
  0            /usr/bin/python3.8   1         auto mode
* 1            /usr/bin/python3.8   1         manual mode

Press <enter> to keep the current choice[*], or type selection number: 
$

Step 3: Removing existing python3.10 that was attempted before:

$ sudo apt remove python3.10
[sudo] password for vkdevu: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package python3.10
E: Couldn't find any package by glob 'python3.10'
$ 

$ sudo apt list | grep python3.10

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

libqgispython3.10.4/focal,now 3.10.4+dfsg-1ubuntu2 amd64 [installed]
$ 

$ sudo apt remove libqgispython3.10.4
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  gdal-data libaec0 libarmadillo9 libarpack2 libblas3 libcfitsio8 libcharls2 libdap25 libdapclient6v5 libdouble-conversion3
  libepsilon1 libfreexl1 libfwupdplugin1 libfyba0 libgdal26 libgeos-3.8.0 libgeos-c1v5 libgeotiff5 libgfortran5 libgif7
  libhdf4-0-alt libhdf5-103 libkmlbase1 libkmldom1 libkmlengine1 liblapack3 libminizip1 libnetcdf15 libodbc1 libogdi4.1
  libpcre2-16-0 libpoppler97 libproj15 libqca-qt5-2 libqca-qt5-2-plugins libqgis-core3.10.4 libqhull7 libqt5concurrent5
  libqt5core5a libqt5dbus5 libqt5gui5 libqt5keychain1 libqt5network5 libqt5positioning5 libqt5printsupport5 libqt5qml5
  libqt5quick5 libqt5sensors5 libqt5serialport5 libqt5sql5 libqt5sql5-sqlite libqt5svg5 libqt5webchannel5 libqt5webkit5
  libqt5widgets5 libqt5xml5 libspatialindex6 libspatialite7 libsuperlu5 libsz2 liburiparser1 libxcb-xinerama0 libxcb-xinput0
  libxerces-c3.2 libzip5 ocl-icd-libopencl1 odbcinst odbcinst1debian2 poppler-data proj-bin proj-data qt5-gtk-platformtheme
  qttranslations5-l10n
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
  libqgispython3.10.4
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 2379 kB disk space will be freed.
Do you want to continue? [Y/n] Y
(Reading database ... 130630 files and directories currently installed.)
Removing libqgispython3.10.4 (3.10.4+dfsg-1ubuntu2) ...
Processing triggers for libc-bin (2.31-0ubuntu9.9) ...
$

Step 4: Ensure that your system is updated and the required packages installed:

$ sudo apt update && sudo apt upgrade -y
Ign:1 https://pkg.jenkins.io/debian binary/ InRelease
Hit:2 https://pkg.jenkins.io/debian binary/ Release                        
Get:3 http://mirrors.digitalocean.com/ubuntu focal InRelease [265 kB]      
Get:5 http://mirrors.digitalocean.com/ubuntu focal-updates InRelease [114 kB]         
Get:6 http://mirrors.digitalocean.com/ubuntu focal-backports InRelease [108 kB]
Get:7 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Get:8 http://mirrors.digitalocean.com/ubuntu focal-updates/main amd64 Packages [1789 kB]
Get:9 http://mirrors.digitalocean.com/ubuntu focal-updates/universe amd64 Packages [921 kB]
Fetched 3310 kB in 2s (1657 kB/s)                                                        
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  gdal-data libaec0 libarmadillo9 libarpack2 libblas3 libcfitsio8 libcharls2 libdap25 libdapclient6v5 libdouble-conversion3
  libepsilon1 libfreexl1 libfwupdplugin1 libfyba0 libgdal26 libgeos-3.8.0 libgeos-c1v5 libgeotiff5 libgfortran5 libgif7
  libhdf4-0-alt libhdf5-103 libkmlbase1 libkmldom1 libkmlengine1 liblapack3 libminizip1 libnetcdf15 libodbc1 libogdi4.1
  libpcre2-16-0 libpoppler97 libproj15 libqca-qt5-2 libqca-qt5-2-plugins libqgis-core3.10.4 libqhull7 libqt5concurrent5
  libqt5core5a libqt5dbus5 libqt5gui5 libqt5keychain1 libqt5network5 libqt5positioning5 libqt5printsupport5 libqt5qml5
  libqt5quick5 libqt5sensors5 libqt5serialport5 libqt5sql5 libqt5sql5-sqlite libqt5svg5 libqt5webchannel5 libqt5webkit5
  libqt5widgets5 libqt5xml5 libspatialindex6 libspatialite7 libsuperlu5 libsz2 liburiparser1 libxcb-xinerama0 libxcb-xinput0
  libxerces-c3.2 libzip5 ocl-icd-libopencl1 odbcinst odbcinst1debian2 poppler-data proj-bin proj-data qt5-gtk-platformtheme
  qttranslations5-l10n
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
$

Step 5: Install Python 3.10 on Ubuntu 20.04|18.04 using Apt Repo:

$ sudo apt install software-properties-common -y
Reading package lists... Done
Building dependency tree       
Reading state information... Done
software-properties-common is already the newest version (0.99.9.8).
software-properties-common set to manually installed.
The following packages were automatically installed and are no longer required:
  gdal-data libaec0 libarmadillo9 libarpack2 libblas3 libcfitsio8 libcharls2 libdap25 libdapclient6v5 libdouble-conversion3
  libepsilon1 libfreexl1 libfwupdplugin1 libfyba0 libgdal26 libgeos-3.8.0 libgeos-c1v5 libgeotiff5 libgfortran5 libgif7
  libhdf4-0-alt libhdf5-103 libkmlbase1 libkmldom1 libkmlengine1 liblapack3 libminizip1 libnetcdf15 libodbc1 libogdi4.1
  libpcre2-16-0 libpoppler97 libproj15 libqca-qt5-2 libqca-qt5-2-plugins libqgis-core3.10.4 libqhull7 libqt5concurrent5
  libqt5core5a libqt5dbus5 libqt5gui5 libqt5keychain1 libqt5network5 libqt5positioning5 libqt5printsupport5 libqt5qml5
  libqt5quick5 libqt5sensors5 libqt5serialport5 libqt5sql5 libqt5sql5-sqlite libqt5svg5 libqt5webchannel5 libqt5webkit5
  libqt5widgets5 libqt5xml5 libspatialindex6 libspatialite7 libsuperlu5 libsz2 liburiparser1 libxcb-xinerama0 libxcb-xinput0
  libxerces-c3.2 libzip5 ocl-icd-libopencl1 odbcinst odbcinst1debian2 poppler-data proj-bin proj-data qt5-gtk-platformtheme
  qttranslations5-l10n
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
$

Step 6: Then proceed and add the deadsnakes PPA to the APT package manager sources list:

$ sudo add-apt-repository ppa:deadsnakes/ppa
 This PPA contains more recent Python versions packaged for Ubuntu.

Disclaimer: there's no guarantee of timely updates in case of security problems or other issues. If you want to use them in a security-or-otherwise-critical environment (say, on a production server), you do so at your own risk.

Update Note
===========
Please use this repository instead of ppa:fkrull/deadsnakes.

Reporting Issues
================

Issues can be reported in the master issue tracker at:
https://github.com/deadsnakes/issues/issues

Supported Ubuntu and Python Versions
====================================

- Ubuntu 18.04 (bionic) Python2.3 - Python 2.6, Python 3.1 - Python 3.5, Python3.7 - Python3.11
- Ubuntu 20.04 (focal) Python3.5 - Python3.7, Python3.9 - Python3.11
- Ubuntu 22.04 (jammy) Python3.7 - Python3.9, Python3.11
- Note: Python2.7 (all), Python 3.6 (bionic), Python 3.8 (focal), Python 3.10 (jammy) are not provided by deadsnakes as upstream ubuntu provides those packages.

Why some packages aren't built:
- Note: for focal, older python versions require libssl<1.1 so they are not currently built
- Note: for jammy, older python versions requre libssl<3 so they are not currently built
- If you need these, reach out to asottile to set up a private ppa

The packages may also work on other versions of Ubuntu or Debian, but that is not tested or supported.

Packages
========

The packages provided here are loosely based on the debian upstream packages with some modifications to make them more usable as non-default pythons and on ubuntu.  As such, the packages follow debian's patterns and often do not include a full python distribution with just `apt install python#.#`.  Here is a list of packages that may be useful along with the default install:

- `python#.#-dev`: includes development headers for building C extensions
- `python#.#-venv`: provides the standard library `venv` module
- `python#.#-distutils`: provides the standard library `distutils` module
- `python#.#-lib2to3`: provides the `2to3-#.#` utility as well as the standard library `lib2to3` module
- `python#.#-gdbm`: provides the standard library `dbm.gnu` module
- `python#.#-tk`: provides the standard library `tkinter` module

Third-Party Python Modules
==========================

Python modules in the official Ubuntu repositories are packaged to work with the Python interpreters from the official repositories. Accordingly, they generally won't work with the Python interpreters from this PPA. As an exception, pure-Python modules for Python 3 will work, but any compiled extension modules won't.

To install 3rd-party Python modules, you should use the common Python packaging tools.  For an introduction into the Python packaging ecosystem and its tools, refer to the Python Packaging User Guide:
https://packaging.python.org/installing/

Sources
=======
The package sources are available at:
https://github.com/deadsnakes/

Nightly Builds
==============

For nightly builds, see ppa:deadsnakes/nightly https://launchpad.net/~deadsnakes/+archive/ubuntu/nightly
 More info: https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa
Press [ENTER] to continue or Ctrl-c to cancel adding it.

Get:1 http://mirrors.digitalocean.com/ubuntu focal InRelease [265 kB]
Ign:2 https://pkg.jenkins.io/debian binary/ InRelease                                                                    
Hit:3 https://pkg.jenkins.io/debian binary/ Release                                                                      
Hit:4 http://mirrors.digitalocean.com/ubuntu focal-updates InRelease                           
Hit:5 http://security.ubuntu.com/ubuntu focal-security InRelease                               
Hit:6 http://mirrors.digitalocean.com/ubuntu focal-backports InRelease                         
Get:7 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal InRelease [18.1 kB]
Get:9 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal/main amd64 Packages [22.5 kB]
Get:10 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal/main Translation-en [5204 B]
Fetched 311 kB in 2s (144 kB/s)                     
Reading package lists... Done
$

Step 7: Download Python 3.10 with the single command below:

$ sudo apt install python3.10
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  gdal-data libaec0 libarmadillo9 libarpack2 libblas3 libcfitsio8 libcharls2 libdap25 libdapclient6v5 libdouble-conversion3
  libepsilon1 libfreexl1 libfwupdplugin1 libfyba0 libgdal26 libgeos-3.8.0 libgeos-c1v5 libgeotiff5 libgfortran5 libgif7
  libhdf4-0-alt libhdf5-103 libkmlbase1 libkmldom1 libkmlengine1 liblapack3 libminizip1 libnetcdf15 libodbc1 libogdi4.1
  libpcre2-16-0 libpoppler97 libproj15 libqca-qt5-2 libqca-qt5-2-plugins libqgis-core3.10.4 libqhull7 libqt5concurrent5
  libqt5core5a libqt5dbus5 libqt5gui5 libqt5keychain1 libqt5network5 libqt5positioning5 libqt5printsupport5 libqt5qml5
  libqt5quick5 libqt5sensors5 libqt5serialport5 libqt5sql5 libqt5sql5-sqlite libqt5svg5 libqt5webchannel5 libqt5webkit5
  libqt5widgets5 libqt5xml5 libspatialindex6 libspatialite7 libsuperlu5 libsz2 liburiparser1 libxcb-xinerama0 libxcb-xinput0
  libxerces-c3.2 libzip5 ocl-icd-libopencl1 odbcinst odbcinst1debian2 poppler-data proj-bin proj-data qt5-gtk-platformtheme
  qttranslations5-l10n
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  libpython3.10-minimal libpython3.10-stdlib python3.10-minimal
Suggested packages:
  python3.10-venv binfmt-support
The following NEW packages will be installed:
  libpython3.10-minimal libpython3.10-stdlib python3.10 python3.10-minimal
0 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
Need to get 5171 kB of archives.
After this operation, 20.0 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get:1 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal/main amd64 libpython3.10-minimal amd64 3.10.4-1+focal2 [820 kB]
Get:2 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal/main amd64 python3.10-minimal amd64 3.10.4-1+focal2 [2073 kB]
Get:3 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal/main amd64 libpython3.10-stdlib amd64 3.10.4-1+focal2 [1746 kB]
Get:4 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal/main amd64 python3.10 amd64 3.10.4-1+focal2 [532 kB]
Fetched 5171 kB in 5s (1098 kB/s)   
Selecting previously unselected package libpython3.10-minimal:amd64.
(Reading database ... 130626 files and directories currently installed.)
Preparing to unpack .../libpython3.10-minimal_3.10.4-1+focal2_amd64.deb ...
Unpacking libpython3.10-minimal:amd64 (3.10.4-1+focal2) ...
Selecting previously unselected package python3.10-minimal.
Preparing to unpack .../python3.10-minimal_3.10.4-1+focal2_amd64.deb ...
Unpacking python3.10-minimal (3.10.4-1+focal2) ...
Selecting previously unselected package libpython3.10-stdlib:amd64.
Preparing to unpack .../libpython3.10-stdlib_3.10.4-1+focal2_amd64.deb ...
Unpacking libpython3.10-stdlib:amd64 (3.10.4-1+focal2) ...
Selecting previously unselected package python3.10.
Preparing to unpack .../python3.10_3.10.4-1+focal2_amd64.deb ...
Unpacking python3.10 (3.10.4-1+focal2) ...
Setting up libpython3.10-minimal:amd64 (3.10.4-1+focal2) ...
Setting up python3.10-minimal (3.10.4-1+focal2) ...
Setting up libpython3.10-stdlib:amd64 (3.10.4-1+focal2) ...
Setting up python3.10 (3.10.4-1+focal2) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for desktop-file-utils (0.24-1ubuntu3) ...
Processing triggers for mime-support (3.64ubuntu1) ...
Processing triggers for gnome-menus (3.36.0-1ubuntu1) ...
$

Step 8: Verify the installation by checking the installed version:

	
$ python3.10 --version
Python 3.10.4
$

Step 9: Add Python 3.10.4 to alternatives config:

$ ls -lrt /usr/bin/ | grep python
lrwxrwxrwx 1 root   root          33 Mar 13  2020 x86_64-linux-gnu-python3-config -> x86_64-linux-gnu-python3.8-config
lrwxrwxrwx 1 root   root          16 Mar 13  2020 python3-config -> python3.8-config
lrwxrwxrwx 1 root   root          31 Mar 13  2020 py3versions -> ../share/python3/py3versions.py
-rwxr-xr-x 1 root   root        3241 Mar 15 12:22 x86_64-linux-gnu-python3.8-config
lrwxrwxrwx 1 root   root          33 Mar 15 12:22 python3.8-config -> x86_64-linux-gnu-python3.8-config
-rwxr-xr-x 1 root   root     5490448 Mar 15 12:22 python3.8
lrwxrwxrwx 1 root   root          23 Mar 15 12:22 pdb3.8 -> ../lib/python3.8/pdb.py
-rwxr-xr-x 1 root   root     5789976 Apr  8 17:35 python3.10
lrwxrwxrwx 1 root   root          24 Apr  8 17:35 pdb3.10 -> ../lib/python3.10/pdb.py
lrwxrwxrwx 1 root   root          25 May 10 04:37 python3 -> /etc/alternatives/python3
$ 

$ sudo update-alternatives --config python3
There is 1 choice for the alternative python3 (providing /usr/bin/python3).

  Selection    Path                Priority   Status
------------------------------------------------------------
  0            /usr/bin/python3.8   1         auto mode
* 1            /usr/bin/python3.8   1         manual mode

Press <enter> to keep the current choice[*], or type selection number: 
$ 

$ python3 -V
Python 3.8.10
$ python -V

Command 'python' not found, did you mean:

  command 'python3' from deb python3
  command 'python' from deb python-is-python3

$ 


$ sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 1
$ sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.10 2
$ 
$ sudo update-alternatives --config python3
There are 2 choices for the alternative python3 (providing /usr/bin/python3).

  Selection    Path                 Priority   Status
------------------------------------------------------------
  0            /usr/bin/python3.10   2         auto mode
  1            /usr/bin/python3.10   2         manual mode
* 2            /usr/bin/python3.8    1         manual mode

Press <enter> to keep the current choice[*], or type selection number: 0
update-alternatives: using /usr/bin/python3.10 to provide /usr/bin/python3 (python3) in auto mode
$ 
$ 
$ python3 -V
Python 3.10.4
$ sudo update-alternatives --config python3
There are 2 choices for the alternative python3 (providing /usr/bin/python3).

  Selection    Path                 Priority   Status
------------------------------------------------------------
* 0            /usr/bin/python3.10   2         auto mode
  1            /usr/bin/python3.10   2         manual mode
  2            /usr/bin/python3.8    1         manual mode

Press <enter> to keep the current choice[*], or type selection number: 
$

Thank you all for looking at my post.

Best regards,
~Ram

Hello Ram Mullapudi,

no offense …

Maybe you change your distro in Linux ? Which Linux Distro (Which Version ?) do you use ?

In Solus Linux is result :

python3 -V

Python 3.10.4

!? (Oooops and I did not know that before your e-mail … )

Greetz. Val.

Hello Val,

I did not change the Linux distro. I’m using the same Ubuntu version: 20.04.4 LTS. Let me know if I understand your post?

~Ram

Yes Ram. You understood my Post.

Did it work now with update in Ubuntu 20.04.4 LTS ?

As I See, this thread ist solved ?

Hi Schmitt,

Can you double check my previous post where I listed all the steps and let me know if this is still not resolved.

~Ram