"please remove installation media and press ENTER" is only shown after installation. I take it you did install Ubuntu and are now (re)booting that, not the live system on the installation medium?
Please follow /usr/share/doc/systemd/README.Debian.gz "Debugging boot/shutdown problems", and check "systemctl list-jobs" which unit is hanging during shutdown. Please also capture the journal output, with "journalctl > /root/journal.txt" and attach /root/journal.txt here. Thanks! ** Changed in: systemd (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1542696 Title: 16.04 LTS Xenial Xerus does not reboot properly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1542696/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs