Ubuntu equivalent of Ctrl+Alt+Del?

[amabuntu]

If my Ubuntu freezes up, what should I do? In Windows I would ordinarily press Ctrl+Alt+Delete, but nothing like that is effective in Ubuntu. What should be done?

[perlluver]

That command would bet Ctrl>Alt>Print Screen>REISUB, yes that is r e i s u b. That will stop the system, and restart it.

[aheckler]

CTRL+ALT+BACKSPACE will restart X and return you to the login page. It works 99.9% of the time.

[dcook32p]

For a more detailed explanation of the Magic SysRq keys, see here:

http://ubuntuforums.org/showthread.php?t=617349

[vishzilla]

That command would bet Ctrl>Alt>Print Screen>REISUB, yes that is r e i s u b. That will stop the system, and restart it.

Its actually Alt+SysRq/PrtScn+REISUB