I freed up space in my laptop, restarted the computer and ran- sudo apt-get install -f
The Update was completed and package gdm was updated correctly. I think that the problem was with the lack of space. The downloaded update files was nearly <165MB( since, I haven't run the updates lately). I had only nearly 400-500MB remaining in my hard-disk, it didn't occur to me that to install all the packages when uncompressed it may take up more space. It would be nice if some sort of error message is included while updating/upgrading to warn the user of low-disk space, for the sake of newbies. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/717587 Title: package gdm 2.30.2.is.2.30.0-0ubuntu5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs