[Bug 217585] Re: aptitude::Delete-Unused behaves incorrectly

[Daniel Hartwig]

apache2-mpm-worker is recommended by trac (through 'provides'):

$ apt-cache show trac | grep Recommends
Recommends: apache2 | httpd, ...
$ apt-cache show apache2-mpm-worker | grep Provides
Provides: apache2, apache2-mpm, httpd, httpd-cgi

so it is expected that having trac installed prevents apache2-mpm-worker
from being removed.  Same situation with bsd-mailx, etc.:

$ apt-cache show bsd-mailx | grep Provides
Provides: mail-reader, mailx


** Changed in: aptitude (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/217585

Title:
  aptitude::Delete-Unused behaves incorrectly

Status in “aptitude” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: aptitude

  when I execute "aptitude install trac", libapr1 is installed, too ,for dependencies.
  then, I execute "aptitude install apache2", apache2-mpm-worker is installed for dependencies.

  later, I "aptitude purge apache2", it prompted me that only apache2 package will be purged.
  "aptitude purge trac", apache2-mpm-worker be uninstalled too.

  I guess:
  trac depend on subverion, subversion depend on libapr1.
  apache2 depend on apache2-mpm-worker, apache2-mpm-worker depend on libapr1.

  When I purge apache2, libapr1 is still depended on by trac/subverion.
  Aptitude thinks that apache2-mpm-worker (the package associated to libapr1) shouldn't be uninstall.
  This is wrong.

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