Sometimes I do wonder about if Ubuntu is actually the Windows of the Linux world, some of their design decisions, like non-closable restart windows…

Nice desktop you have there. Be a good fellow and reboot now ok?

Thankfully xkill closes *all* windows and leaves no survivors. It’s a shame that the general desktop environment on Ubuntu has been so cut down and over simplified over the last few years, since the server Ubuntu LTS releases are actually pretty damn good.