The biggest issue was related to a major upgrade from Ubuntu 18.04 to 20.04 and some packages removed. Also over time people change what they have also installed, like
installing from Ubuntu versions from lambda stack.
Or another is having anaconda or pip software installs, which conflict at time with versions or do not have complete or have out dated installs.
You can check what you have installed with pip (whether in anaconda or out of anaconda with):
$ pip -v list
I use to find what is in the local directly:
$ pip -v list | grep local
And to clean up either use 'pip uninstall ’ or if it easier:
$ mv ~/.local ~/.local.bak
- This will move it to a backup file in case you really want to see what was there.
For testing the system versus in anaconda also:
(anaconda) $ conda deactivate
$ python -c 'import torch; print(torch.version,torch.file)'