I tried to install something with sudo but I received: ".... is not in the sudoers file. this incident will be reported". I used "su -" and "su root" to fix this problem but I got "authentication failure". What should I do to fix this?
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The user needs to be in the sudo
group. Trying su
and sudo root
doesn't work because,for security reasons, Ubuntu has disabled the whole idea of a root
password. You can manage your system easily with a properly configured sudo
. Read man sudo sudoers
.
If you don't have access to any UID 0 account, you'll have to reboot into "single user mode", adduser your_userid sudo
, and reboot again. If you can't use adduser
, read man groups
, and, in single user mode, nano /etc/groups
. Find the line beginning with sudo:
, append your_userid
to the the comma-separated userid list after the second colon. If your_userid
is the only one, no comma is needed.

waltinator
- 36,399
sudo
privileges and have them add you to sudoers. Next alternative is to boot the system off of a live image and add yourself to sudoers. – doneal24 Jul 24 '23 at 13:03