Prevent Ubuntu Server from Sleep

Dis­able sus­pend:

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

Bring it back:

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

Ref­er­ences:

• Unix & Lin­ux : Ubun­tu Serv­er Con­tin­u­ous­ly „goes to sleep“
• Ask Ubun­tu: How to pre­vent Ubun­tu Serv­er sleep/​​​hibernation