Comment 2 for bug 537367

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Bálint Magyar (balintm) wrote : Re: Technobabble when trying to update repository data or install package if another package management job is running

Similarly, if a package manager is running and Rhythmbox or Totem prompts for a codec install, the same conflict produces different error messages.

"Unable to get exclusive lock
This usually means that another package management application (like apt-get or aptitude) is already running. Please close that application first."

And that after clicking OK:

"No packages installed
None of the selected packages were installed."