SUMMARY PC needs to be unlocked in order to be manually put it to sleep, or shutdown/restart. At least let us put it to sleep from the lock screen. STEPS TO REPRODUCE 1. Lock the screen 2. Press the power button (or the button used to put the PC to sleep) OBSERVED RESULT No reaction EXPECTED RESULT PC to go to sleep or ask whether to put it to sleep, or a on option to shutdown, sleep or restart SOFTWARE/OS VERSIONS Operating System: Kubuntu 18.10 KDE Plasma Version: 5.15.2 KDE Frameworks Version: 5.54.0 Qt Version: 5.11.1 Kernel Version: 4.18.0-15-generic OS Type: 64-bit Processors: 4 × Intel® Core™ i5-6500 CPU @ 3.20GHz Memory: 15.6 GiB of RAM ADDITIONAL INFORMATION There's no button to put the PC to sleep, shutdown or restart from lockscreen.
*** This bug has been marked as a duplicate of bug 336369 ***