Specification updated.
<https://wiki.ubuntu.com/SoftwareCenter?action=diff&rev2=688&rev1=687>

** Changed in: software-center (Ubuntu)
       Status: Confirmed => Triaged

** Changed in: software-center (Ubuntu)
     Assignee: Matthew Paul Thomas (mpt) => (unassigned)

** Description changed:

+ software-center 5.4.1.3, Ubuntu 12.10
+ 
  I downloaded steam_latest.deb from steampowered.com, saved it, double
  clicked on it, and Software Center launched.  It brought up the deb
  information page, I clicked Install, and Software Center proceeded to
  remove literally about half of the installed pacakges on my system
  (about 400), including things like unity, ubuntu-desktop, and,
  ironically, software-center itself.  It eventually errored out (see
  attached log).
  
  Using /var/log/apt/history.log, I was able to restore the system's
  packages to their previous state, but Software Center shouldn't have
  allowed this to happen (whether or not the third-party .deb was actually
  at fault).
  
  NB: To correct the apt error, I did "apt-get -f install".  Then, after I
  apt-get installed the packages which were removed, steam was still
  installed, so it wasn't a dependency error which caused the packages to
  be removed.  I have no idea why it actually happened.
  
- ProblemType: Bug
- DistroRelease: Ubuntu 12.10
- Package: software-center 5.4.1.3
- ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
- Uname: Linux 3.5.0-21-generic x86_64
- ApportVersion: 2.6.1-0ubuntu10
- Architecture: amd64
- Date: Wed Jan 30 00:53:19 2013
- InstallationDate: Installed on 2012-06-14 (230 days ago)
- InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
- MarkForUpload: True
- PackageArchitecture: all
- ProcEnviron:
-  TERM=xterm
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
- SourcePackage: software-center
- UpgradeStatus: Upgraded to quantal on 2012-09-16 (136 days ago)
+ <https://wiki.ubuntu.com/SoftwareCenter#installing>: "4. If installing
+ the software would involve removing ubuntu-desktop, the package should
+ be treated as uninstallable (just as it is with software updates). 5. If
+ the relevant package cannot be installed, for that reason or any other,
+ an error alert should appear..."

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https://bugs.launchpad.net/bugs/1110188

Title:
  USC allows a package installation to uninstall vital packages

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