Some times I want to just shut the computer down rather than to enter the password and continue. Even if that would be someone else willing to shut my computer down while I'm away he should better be able to do this peacefully rather than by just switching the power off. Can I add shutdown to the lock screen menu for such cases?

Update for those saying it's there: I use the standard Ubuntu 15.10 (not any kind of "spin-off" like KUbuntu nor a derivative like Mint or ElementaryOS) and all I have got in the upper-right corner gear menu is "Switch Account", "Guest Session" and "Suspend".

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    Ubuntu's default lockscreen does have this option, I have it on my 14.04, pretty sure 15.10 also does. What version do you use ? And you do know about the sysrq keys , right ? – Sergiy Kolodyazhnyy Nov 19 '15 at 4:08
  • top right corner, a gear/power icon, click for a menu - in it is shutdown. unless you are using something other than "Ubuntu" – Mateo Nov 19 '15 at 4:14
  • @Serg no, what's there about sysrq? It seems to do notink on my lock screen and it calls gnome-screenshot in normal mode (yes, I'm sure I'm pressing SysRq, not PrintScreen (these are separate keys on my laptop keyboard )) – Ivan Nov 19 '15 at 19:22
  • @Mateo I use standard Ubuntu 15.10, it's not there. – Ivan Nov 19 '15 at 19:23
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    @Ivan If it's not there , you should report it as a bug, because it is supposed to be there. As for Sysrq, it's used to safely shutdown or reboot a system when it becomes unresponsive, but can be used to just plain shutdown it as well. Hold Atl+Sysrq, and then press one by one r-e-i-s-u-o. If you replace o with b , that's reboot, o is shutdown – Sergiy Kolodyazhnyy Nov 19 '15 at 19:50

You actually don't need to add shutdown to that menu.

You can click on Switch Account and you'll have Shutdown on the new screen's menu.

That way, it's possible to shut the computer down without logging in first. That works on ubuntu 14.04 LTS and 16.04 LTS.

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