System
Recovery
Type the phrase “REISUB” while holding down the Alt and SysRq (Print Screen button) with about 1 second between each letter. This will FORCE a system shutdown and reboot to a unresponsive computer.
lsb_release -a
Displays the current Ubuntu release/version number
uname -r
Displays the current kernel version
uname -a
Displays all current kernel information

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