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How to Disable Sleep, Suspend and Hibernate on Ubuntu Server 20.04 LTS - 18.04 LTS - 16.04 LTS

Open a console or terminal for access to the Ubuntu command line.

To Disable Suspend enter:

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

To Enable Suspend enter:

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