KDE Plasma Shortcuts and System Settings

sudo nano /etc/default/grub => GRUB_CMDLINE_LINUX_DEFAULT="" // verbose boot mode

sudo update-grub

Shortcuts

Ctrl+Esc // "System Monitor" which is a slimmed down KSysGuard without the sensor tabs

Alt+F2, Alt+Space // KRunner

Ctrl+Alt+Del // Log Out

Meta+Alt+K // Switch to Next Keyboard Layout

Meta+L // Lock Session

Custom Shortcuts > Examples > Ctrl+Al+T // tick Examples and Run Konsole

Advanced Power Settings > Energy Saving > Screen Energy Saving

Graphic Tablet

System Settings > Workspace Behavior > Screen Locking > Lock screen automatically

Ctrl+Alt+F2 // switch to tty2 (terminal only interface) => login prompt up to Ctrl+Alt+F6

Alt+F1 // back to  regular GUI => tty

ps ax | grep -v grep | grep getty

  3819 tty2     Ss+    0:00 /sbin/agetty -o -p -- \u --noclear - linux
  3820 tty4     Ss+    0:00 /sbin/agetty -o -p -- \u --noclear - linux
  4146 tty3     Ss+    0:00 /sbin/agetty -o -p -- \u --noclear - linux
  4168 tty5     Ss+    0:00 /sbin/agetty -o -p -- \u --noclear - linux
  4180 tty6     Ss+    0:00 /sbin/agetty -o -p -- \u --noclear - linux

Ctrl+Alt+F7 // switch to tty7 (terminal only interface) => seventh virtual tty => empty

Ctrl+Alt+Del in ttys allows to reboot system without using hard reset.

https://askubuntu.com/questions/277517/what-does-ctrl-alt-f12-do