This error message indicates that you have a non-default filesystem on /mnt that's in a problematic state. The base-files package provides the /mnt directory on the filesystem, so dpkg assumes it should be able to unpack that directory if necessary. I think you will need to unmount /mnt on your system to upgrade base-files.
Marking this bug as invalid, because I don't believe there's anything we can do in base-files to mitigate this. ** Changed in: base-files (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1352012 Title: package base-files 7.2ubuntu5 failed to install/upgrade: unable to stat `./mnt' (which I was about to install): Transport endpoint is not connected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/base-files/+bug/1352012/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs