python -m pip install tensorflow
Defaulting to user installation because normal site-packages is not writeable
ERROR: Could not find a version that satisfies the requirement tensorflow (from versions: none)
ERROR: No matching distribution found for tensorflow
It looks like you’re running with the system python. If this is Linux, depending on the vintage of the installation, they’re often quite old versions. (python -V will tell you.) Maybe it’s too old for tensorflow.
Using a virtual environment (created with venv) is a good idea when installing packages, and should avoid the first message, which is often the root cause of what follows.