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This is sort of confusing. I have synaptic package manager version 0.84.3(latest). It is showing virtualenv as 'not installed' although it has been installed. When i do the following in CLI

virtualenv --version

It tells the version of virtualenv which is 16.4.0

BUT

when i do

apt-cache policy virtualenv

It shows

  Installed: (none)
  Candidate: 15.1.0+ds-1.1

Any thoughts appreciated!

EDIT:

$ which virtualenv
/home/user/.local/bin/virtualenv

$ dpkg -S $(which virtualenv)
dpkg-query: no path found matching pattern /home/user/.local/bin/virtualenv
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  • To be completely sure about the method how it was installed - please add output of which virtualenv and dpkg -S $(which virtualenv) to the question.
    – N0rbert
    May 4, 2019 at 16:38
  • @N0rbert - Answered your question in the edit.
    – damn
    May 4, 2019 at 17:20
  • The /home/user/.local/bin/virtualenv is not maintained by APT in any way.
    – N0rbert
    May 4, 2019 at 17:21

1 Answer 1

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If virtualenv was installed from source code, rather than a .deb or PPA, then Synaptics and APT will be unaware of the program installed.

As your version of virtualenv was only released 2/22/2019 and not available in Launchpad or the Ubuntu repositories, I assume that it was installed from source.

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  • Would your answer change after my question edit?
    – damn
    May 4, 2019 at 17:21
  • 1
    @VishalMahajan No, but it does resolve a little bit about who installed the program!
    – Charles Green
    May 4, 2019 at 17:24
  • Thanks for the info Charles. I now remember that i installed it(virtualenv) using pip3 command. I think that is why APT & Synaptics were unaware.
    – damn
    May 5, 2019 at 1:35
  • @VishalMahajan That's likely the case. Because of where it is installed, it is only visible to your account. I imagine that you have been writing some program to be run under another user?
    – Charles Green
    May 5, 2019 at 2:08
  • I was just trying to get started with TensorFlow. So i was following an instructor without knowing what's going under the hood.
    – damn
    May 5, 2019 at 5:59

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