Disabling Suspend/Sleep Mode on Ubuntu

This post describes how to prevent Ubuntu Server/Desktop from entering Suspend or Sleep mode.

[01] Environment and Situation

• Ubuntu 24.04 Server / Desktop
• While using Ubuntu remotely over SSH, the connection drops and cannot be re-established
• After a period of inactivity, the system transitions into Suspend/Sleep mode, dropping the session
• Some desktop environments require a reboot to recover

[02] Cause

By default, Ubuntu 24.04 has Suspend/Sleep mode enabled.

sudo systemctl status sleep.target suspend.target hibernate.target hybrid-sleep.target

[03] Solution

Mask the related services so they cannot start.

sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target

[04] Additional Notes

To re-enable these features:

sudo systemctl unmask sleep.target suspend.target hibernate.target hybrid-sleep.target