*** This bug is a duplicate of bug 804821 ***
https://bugs.launchpad.net/bugs/804821
Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 804821, so it is being marked as such. Please look at
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https://bugs.launchpad.net/bugs/784190
Title:
package gdm (not installed) failed to install/upgrade: subprocess
installed pre-removal script returned error exit status
