Is it possible to include a user in a sudo group without root privileges?

R

Roman Radic2017-01-31 00:09:21

linux

Roman Radic, 2017-01-31 00:09:21

When setting up the server, Ubuntu 16.04 added itself to the sudo group. Everything worked fine, I disabled the root user for security reasons. Today I needed to add myself to the www-data group. Added with the command usermod -G www-data username . Now when I try to use sudo, it says is not in the sudoers file. This incident will be reported. . I understand that now I'm not in the sudo group. Is it possible to somehow fix this situation, or just reinstall the server?
PS
The server is not local, it's a remote VPS. The root password is not known to me either, authorization was only by SSH keys. I have my private keys, but the root user is disabled.

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2 answer(s)

K

K-700A, 2017-01-31
@K-700A

Needed was usermod -a -G www-data username . Without the "-a" option, you've left the user out of the rest of the groups.
The solution is here . Verified.

A

Alexey Cheremisin, 2017-01-31
@leahch

Usually I add a group with the command
Well, in order to restore justice, just boot from a flash drive and fix the group in /etc/groups and /etc/passwd
Well, you can boot without a flash drive, just adding init=/bin/ to the kernel boot parameters bash
And then remount the root system
mount / -o remount,rw