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CAUTION: All the below commands will COMPLETELY BREAK your OS.

I removed all version by doing :

sudo apt purge python-pip python-dev
 sudo rm -rf /usr/bin/python*
 sudo rm -rf /etc/python*
 sudo rm -rf /usr/local/lib/python*
 sudo rm -rf /usr/share/man/man1/python*
 sudo rm -rf /usr/share/python*
 sudo rm -rf /usr/local/bin/pip*

Now when i try to install again :

sudo apt-get install python3

It detects it is already installed ?

Any idea how to complety remove old versions ?

thanks

Gulzar
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user1361815
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    Congratulations. Looks like you may have thoroughly trashed your Ubuntu install. Apt depends upon Python3 to work properly. Also, NEVER use `rm` to remove packages that were installed by apt. Your command isn't *detecting* anything - apt is simply querying it's internal database...which no longer matches reality. – user535733 Oct 02 '19 at 18:09
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    your best course of action is probably a re-install. make a backup of your personal files from the live session prior to reinstalling. you can do that without a format if needed but that will leave trails from the older install. – Rinzwind Oct 02 '19 at 18:16

1 Answers1

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The proper course of action after breaking your system so thoroughly is to re-install. You might be able to fix the system by running 

dpkg -l | grep python     # see what the system think's is installed
sudo mv /var/lib/dpkg/info/python* /tmp/   # get rid of the apt database files
sudo apt-get update
sudo apt-get install *list-of-packages*

where the list-of-packages came from the first command.

doneal24
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  • I don't think APT will work and system is recoverable unless packages are manually downloaded from packages.ubuntu.com and installed using DPKG. – Kulfy Oct 02 '19 at 18:34
  • apt needs python. There is a way to reinstall apt without using apt or dpkg though but I can'f find how D: – Rinzwind Oct 02 '19 at 18:39
  • This was the major issue in "might work". As @Kulfy indicated, you could try downloading the .deb files for python and installing them manually using `dpkg`. – doneal24 Oct 03 '19 at 15:09