Are you running a live CD session and trying to upgrade that? One should not do that, as it's not supported to dist-upgrade CDs.
cp: cannot create regular file '/cdrom/casper/initrd.gz.new': No such file or directory dpkg: error processing package udev (--configure): subprocess installed post-installation script returned error exit status 1 ** Changed in: systemd (Ubuntu) Importance: High => Undecided ** Changed in: systemd (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1648959 Title: package udev 229-4ubuntu12 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1648959/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs