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I made a big mistake when executed command:
sudo usermod -G vboxusers me
instead of "gpasswd" or "adduser", and I lost sudo group. Is it possible restore it, if I dont know root password, and have only access via ssh? I also have access to PhpMyAdmin. Ubuntu linux.
The documentation for usermod is downright misleading. It actually says "new list of supplementary groups". – James McLaughlin – 2016-12-13T19:27:47.160