CTRL+ALT+F4 <===> pokud zmrzne PC zkusit nejprve toto
CTRL+ALT+BACKSPACE <===> pokud nepomuze vyse uvedene zkusit toto // On some Linux systems this will reset the desktop/GUI completely
CTRL+ALT+DEL <===> also work on some Linux systems, so try it too.
ALT+PrtScr(SysRq), současně REISUB <===> restartuje PC bez pouziti power tlacitka