The system is Ubuntu 22.04.2.I mistakenly removed my user from sudoers, and the root account cannot login directly.Now, if I use the "sudo" command, "user is not in the sudoers file. This incident will be reported." will be displayed.I only have read-only permission to system files.
I tried to add my account to sudoers file, but shown Permission denied.Is there any way to restore my user to sudoers?sudoers screenshot