So I just did a sudo apt-get upgrade and said Y to a question it asked me and now I am not a sudoer anymore. Even our root isn't a sudoer anymore. What's the solution?
Configuration file '/etc/sudoers'
==> Modified (by you or by a script) since installation.
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : start a shell to examine the situation
The default action is to keep your current version.
*** sudoers (Y/I/N/O/D/Z) [default=N] ? Y
Installing new version of config file /etc/sudoers ...
Setting up apt-transport-https (1.0.1ubuntu2.15) ...
Setting up libisc95 (1:9.9.5.dfsg-3ubuntu0.10) ...
Setting up libdns100 (1:9.9.5.dfsg-3ubuntu0.10) ...
Setting up libisccc90 (1:9.9.5.dfsg-3ubuntu0.10) ...
Setting up libisccfg90 (1:9.9.5.dfsg-3ubuntu0.10) ...
Setting up libbind9-90 (1:9.9.5.dfsg-3ubuntu0.10) ...
Setting up liblwres90 (1:9.9.5.dfsg-3ubuntu0.10) ...
Setting up bind9-host (1:9.9.5.dfsg-3ubuntu0.10) ...
Setting up dnsutils (1:9.9.5.dfsg-3ubuntu0.10) ...
Setting up dbus (1.6.18-0ubuntu4.4) ...
Installing new version of config file /etc/dbus-1/system.conf ...
Setting up python3-update-manager (1:0.196.22) ...
Setting up update-manager-core (1:0.196.22) ...
Setting up bazel (0.4.0) ...
Setting up cuda-repo-ubuntu1404 (8.0.44-1) ...
OK
Setting up dbus-x11 (1.6.18-0ubuntu4.4) ...
Setting up dkms (2.2.0.3-1.1ubuntu5.14.04.9) ...
Setting up firefox (49.0.2+build2-0ubuntu0.14.04.1) ...
Please restart all running instances of firefox, or you will experience problems.
Setting up libxnvctrl0 (361.93.02-0ubuntu1) ...
Setting up linux-generic-lts-saucy (3.13.0.100.108) ...
Setting up linux-headers-generic-lts-saucy (3.13.0.100.108) ...
Setting up linux-image-generic-lts-saucy (3.13.0.100.108) ...
Setting up linux-libc-dev:amd64 (3.13.0-100.147) ...
Setting up linux-tools-common (3.13.0-100.147) ...
Setting up python-pil (2.3.0-1ubuntu3.3) ...
Setting up python-imaging (2.3.0-1ubuntu3.3) ...
Processing triggers for libc-bin (2.19-0ubuntu6.9) ...
mona@pascal:~/computer_vision/deep_learning/ssd/caffe$ sudo apt-get install build-essential cmake git pkg-config
mona is not in the sudoers file. This incident will be reported.
mona@pascal:~$ pwd
/home/mona
mona@pascal:~$ su -
Password:
su: Authentication failure
mona@pascal:~$ sudo passwd root
[sudo] password for mona:
mona is not in the sudoers file. This incident will be reported.
UPDATE: In the grub, I selected advanced options and then recovery mode -> root and changed the password using passwd mona and set the passwd however it still doesn't let me sudo after rebooting! Please suggest solutions.
mona@pascal:~$ su -
Password:
su: Authentication failure
The usual way to give
sudorights to an account in Ubuntu is to add it to theadminand/orsudogroups, which are givensudorights by default.If you really want to modify your sudoers configuration, you should not edit
/etc/sudoersdirectly, but add your local configuration in a separate file in the directory/etc/sudoers.das described inman sudoers. This is to avoid the problem you just experienced: since your changes will not be in/etc/sudoers, you can safely upgrade it to newer versions without losing your configuration.In order to modify system files if
sudowon't work, you can go through recovery mode. You can then, for example, addmonato thesudogroup withWhoops, your "Y" accepted a new version of the sudoers file that obviously doesn't have you in it! In the future, a "D" to compare them would have been a better option, though it's also not clear that this should have happened in the first place: having your sudoers file replaced while installing software is not very professional. At this point, you'll need to log in as root (not yourself with sudo) and re-add yourself ("mona") to the Users section of the file.
You can use a command like this:
In place of
username, put the username you want added to thesudogroup. If you runsudo gpasswd -a mono sudo, it givessudoprivileges to themonouser and, due to the-aoption, actually adds that user to thesudogroup.