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When I try to add a group in the terminal with "sudo groupadd newgroup", I get the following: groupadd: cannot lock /etc/group; try again later.
I need to add this group, so that I can add www-data to this group
@oschelde try that on the host itself, not an app container terminal.
@oschelde can you give us more context? Why do you want to add www-data to another group? I can't think of a practical situation where this is needed on Cloudron.