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19
Jan

Error: username is not in the sudoers file. This incident will be reported.

If you try to use sudo to run commands with root privileges in Ubuntu Linux and you get the following error message:

username is not in the sudoers file.  This incident will be reported.

then you must boot in Recovery mode and either add the username to admin group (which is allowed to use sudo) or edit the config file by running:

visudo

and add the following line:

username ALL=(ALL) ALL

where username is your username you want to allow to run sudo.

19
Jan

Remount a root filesystem with read write options in Ubuntu Linux

Let’s say you’ve entered in Recovery mode and you want to make changes to your config files (for example you want to add a new user or you want to change network config) but your root partition is mounted read only. To mount it read write run:

mount -o remount,rw /