When all else fails try using the REISUB magic SysRq key sequence.
Alt + Sys Req and then type
If you don’t have a
Sys Req key you should have
PrtScr which will work the same. Also, some laptops might require that you press
The magic SysRq key is a key combination understood by the Linux kernel, which allows the user to perform various low-level commands regardless of the system’s state. It is often used to recover from freezes, or to reboot a computer without corrupting the filesystem.
In this particular case, REISUB does the following:
for more info checkout the wikipedia page