I have a workaround for this. Since the error is "rm: cannot remove '/var/log/udev': Is a directory" what I did was to manually remove the folder
sudo rm -r /var/log/udev and then restart the configuration of the packages with sudo dpkg --configure -a This led to a successfull upgrade to 16.04. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1574004 Title: package udev 229-4ubuntu4 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/1574004/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs