[Bug 776827] Re: trying to remove a package is triggering an impossible broken dependency

[dino99]

https://wiki.ubuntu.com/Releases

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

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https://bugs.launchpad.net/bugs/776827

Title:
  trying to remove a package is triggering an impossible broken
  dependency

Status in “apt” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: apt

  today I was trying to remove plymouth to solve a black screen during
  boot issue, and apt got me some pretty odd messages... first was about
  an Apache engine (apache2-mpm-prefork) being incompatible with another
  (apache2-mpm-worker)

  Of course they are, but why removing plymouth woukd trigger this?

  So I have tried to install the latter (apache-mpm-worker) which, of
  course removed the incompatible one automatically (apache-mpm-prefork)
  and a few php5 libraries with it...

  $ sudo apt-get remove --purge plymouth
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:

  The following packages have unmet dependencies:
   apache2-mpm-prefork : Conflicts: apache2-mpm
   apache2-mpm-worker : Conflicts: apache2-mpm
   procps : Depends: upstart-job
            Depends: initscripts but it is not going to be installed
  E: Broken packages

  when I have tried it again I got this even stranger message about
  upstart-job and iniscripts ... but none should be affected or envolved
  with the plymouth package I was trying to remove.

  $ sudo apt-get autoremove --purge plymouth
  [sudo] password for leitao: 
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:

  The following packages have unmet dependencies:
   procps : Depends: upstart-job
            Depends: initscripts but it is not going to be installed
  E: Broken packages

  I am not installing or removing anything that could trigger that
  messages! Not sure what could happen if keep walking dows this path,
  but it seems that it will destroy my machine, so I gave up and
  reinstalled the packages I have taken out just in case

  is my packaging system broken beyond repair?

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: apt 0.8.13.2ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-9.43-generic 2.6.38.4
  Uname: Linux 2.6.38-9-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  CheckboxSubmission: 8ffa75e1b233799807120f5ed7003ee9
  CheckboxSystem: cc699a849d78f423c8e1f0dfc5139850
  Date: Tue May  3 22:07:28 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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