Successfully updated Ubuntu 16.04 to 18.04 on Linode

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Just a quick “tutorial” how I upgraded my Linode running Ubuntu 16.04 to 18.04.

1. Make sure all updates are installed.
2. Run: do-release-upgrade
3. Keep all config files the way they are. Press N to all changes (default).
4. After the install is finished, press y to restart server.
5. Edit /etc/apt/sources.list, and uncomment the Virtualmin repositories. Then change any references of xenial in those repositories to bionic.
   Run this command, and make sure the new apt config works properly:
   apt-get update
6. Verify DNS Config Edit /etc/resolv.conf, and verify that the nameserver line is configured to use 127.0.0.1 as a nameserver.
7. Manually edit OS version: Webmin > Webmin Configuration > Operating System and Environment - Set Operating system according to Webmin to the detected version.
8. Run: sudo update-grub and reboot after
9. Now, log into Virtualmin, and go into System Settings -> Re-Check Config, and verify that it doesn’t detect any problems.