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"Once filesystems are mounted read-only you can safely power off the machine." In Ubuntu/Kubuntu there was once a key combination to forcefully unmount all fil

by jk2323 9y ago

"Once filesystems are mounted read-only you can safely power off the machine." In Ubuntu/Kubuntu there was once a key combination to forcefully unmount all file systems. THey seemed to have discontinued this? No?

kbaker 9y ago
You are looking for the Magic SysRq Key: https://en.wikipedia.org/wiki/Magic_SysRq_key https://en.wikipedia.org/wiki/Magic_SysRq_key - Alt+SysRq+u remounts all filesystems readonly. Looks like some of the Magic SysRq Keys are disabled by default now in new Ubuntus.
- vanni 9y ago
  https://askubuntu.com/questions/11002/alt-sysrq-reisub-doesnt-reboot-my-laptop https://askubuntu.com/questions/11002/alt-sysrq-reisub-doesn...
- Piskvorrr 9y ago
  Yup. You need to set kernel.sysrq=1 , probably in /etc/sysctl.conf