[Bug 1091228] Re: No record of which repository a package was installed from

[Daniel Hartwig]

> If I'm not wrong I think the command apt-cache policy <package> show
> the source it was installed from.

That command shows the sources each version is /available/ from, not
where it was installed from.

> If and only if the said package/version still exists in one of your
sources.

Some times, and only by coincidence.  That is not a reliable indicated
of whether such a package was installed from a particular source.

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https://bugs.launchpad.net/bugs/1091228

Title:
  No record of which repository a package was installed from

Status in “apt” package in Ubuntu:
  New

Bug description:
  Currently, for any given package you have installed, there is no
  record of which source/repository it was installed from.

  This is important if, for example, you want to remove an experimental
  repository (such as a PPA). The repository may no longer contain those
  packages, and may no longer even exist, but you may still want to
  remove all software that was installed from that repository (bug
  625628).

  It may also be helpful, when diagnosing problems, to tell whether any
  installed packages are from unusual sources.

  apt could record the source used whenever installing or
  upgrading/downgrading a package.

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