@Lucas: Welcome to the world of Linux... When I originally reported this
bug, here[1], I also reported how to recover from it without needing to
disconnect the power. For any operating system, disconnecting the power
is undesirable; one of the advantages of Linux is that there is often a
way to recover gracefully without losing your work and possibly damaging
your file system. Unfortunately, learning all the techniques isn't easy.
In this case, I found that for me it was possible to gracefully recover
the system by "switching to another linux virtual terminal" (eg. press
Ctrl+Alt+F2), logging into to a text session, and restarting the sddm
service ('systemctl restart sddm.service'). Since you're a new user to
linux, you may want to consider giving it a try. For the long term, the
thing to remember is that one option for you to try to recover a system
is the basic technique: switch to another virtual terminal, log in, and
start examining / fixing things.
[1] https://bugs.launchpad.net/lubuntu-tweaks/+bug/1804544
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https://bugs.launchpad.net/bugs/1804554
Title:
18.10: lubuntu sddm crashes with openbox session
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