What do I do, when my PC freezes?
Windows has ctrl+alt+del, does Linux Mint has something comparable? The only thing I know about is REISUB, but that borked my PC, so I am hesitant to use that again.
Are there any remaining alternatives to waiting and/or using the power button?
Edit: Thank you all for your insights and possible fixes. Crashes usually happened when I was running (cpu/ram?) heavy workload. Increasing swap space was not even on my radar, so I did that now. :) Hopefully Mint will run more stable now.
On Mint this might not be an issue because you should have swap. But an Out Of Memory situation on Linux is basically non-recoverable (or, not fun – reboot is quicker).
Try running
earlyoomin atmuxsession to see if that prevents future crashes.