I need my office PC to be permanently available so I can access it remotely. This was working just fine after I disabled all the sleep mode settings when I was logged on at work. Then I remotely rebooted and after a period of inactivity the machine went to sleep. This was because no one was logged onto the system and it sat at the gdm greeter waiting for someone to login.
How to prevent sleeping when no one is logged in
Mask the sleep related services
sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.targetSet the gdm user not to sleep.
sudo -u gdm dbus-launch gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type 'nothing'Verify the gdm user setting
sudo -u gdm dbus-launch gsettings get org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type