systemctl unmask
linux
Unmask units to make them startable again. This undoes the effect of `systemctl mask`.
More info →Examples (3)
Unmask a service
systemctl unmask service_nameUnmask and start a service immediately
systemctl unmask service_name --nowUnmask a user service
systemctl unmask service_name --usermade by @shridhargupta | data from tldr-pages