Загрузите в командной строке 12.04 (параметры grub не работают) [дубликат]

В документации (/usr/src/linux*/Documentation/sysrq.txt) сказано следующее:

On x86   - You press the key combo 'ALT-SysRq-<command key>'. Note - Some
           keyboards may not have a key labeled 'SysRq'. The 'SysRq' key is
           also known as the 'Print Screen' key. Also some keyboards cannot
           handle so many keys being pressed at the same time, so you might
           have better luck with "press Alt", "press SysRq", "release SysRq",
           "press <command key>", release everything.