This extension gives you the option to shutdown. reboot, suspend, hibernate and logout your pc. It also have an option to change the icon of the options to fit your theme.
If you need an option to logout to your desktop environment just add an issue and i will see what i can do :D
- Systemd
Just go to ulauncher extensions tab and paste the repo link to it.
https://github.com/lighttigerXIV/ulauncher-session-manager