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I am relatively new to this. I have installed various python2.7 packages, sometimes with apt-get, sometimes with pip, sometimes from source. I am experiencing millions of different issues when trying to remove, upgrade or install a new package. So, I want to remove ALL python packages, and start with a clean installation. Is there a relatively safe way to do this?

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    At the moment you succeed to uninstall all python packages, your system is unusable. You won't be able to do any basic action, including installing/uninstalling. – Jacob Vlijm Oct 11 '16 at 10:13
  • So reinstall ubuntu then? Or is there a way to identify the packages which will not crash my system – matejom Oct 11 '16 at 10:16
  • Look into /var/log/apt , there's bunch of history logs. Read through them using less and zless commands and find what packages you installed. But if you don't mind reinstalling then do that - simplest way – Sergiy Kolodyazhnyy Oct 11 '16 at 10:19
  • @Serg then there is pip, I never use that, not sure what it does and where. > reinstalling seems best. – Jacob Vlijm Oct 11 '16 at 10:25
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    Now that I have read this question 3 times very very slowly, what pops out is " I am experiencing millions of different issues when trying to remove, upgrade or install a new package", which is clearly an XY problem and absolutely no clarity on what millions of issues appear and what method they use to deal with packages. – Sergiy Kolodyazhnyy Feb 19 '18 at 20:09
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Warning!

This is an answer to your question!

pip has an option that allows you to process an uninstall without confirmation: --yes. So if you get all packages and then execute them one by one with the uninstaller, you'll remove all of them.

To do that you can use the xargs command: it will allow you to use \n as a separator (see man xargs for more information)

so all that together is just one command that will remove all of the installed Python packages::

pip freeze | xargs pip uninstall --yes

Source

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    OK, but should be noted this is a very unforgiving approach. I've installed pip3 from scratch and pip3 freeze showed list packages even before I installed anything at all, which tells me this may remove more than one actually needs, i.e. not just stuff OP themselves installed via pip install <package>. – Sergiy Kolodyazhnyy Feb 19 '18 at 20:09
  • It's what he asked for, no? Remove all Python packages? – Fabby Feb 19 '18 at 20:16
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    OP doesn't always know what they ask and what sort of implications it may have. Not saying it's a wrong interpretation, just giving a word of caution. – Sergiy Kolodyazhnyy Feb 19 '18 at 20:30
  • @SergiyKolodyazhnyy Warning added! :-) – Fabby Feb 19 '18 at 21:02

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