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I accidentally changed my primary group using the following command.

sudo usermod -g localgroup shantanu #shantanu is my username

I interrupted this process as soon as I realize what is happening. As a result sudo was working but pkexe was affected. So I tried to restore my primary group using the same command

sudo usermod -g shantanu shantanu

Then I reboot my system. Now i can't use sudo. So I open root shell (recovery) and run the following the command

usermod -G sudo shantanu

But when I log in back to my account and run groups command, sudo is not listed. Also i can't use sudo. Finally what i did, add my user in visudo but i don't want to do this.

How can I add my user into sudo group? Thanks in advance.

System:

ubuntu 14.04 64bit (up to date)
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What is output of sudo adduser shantanu? –  Pandya Jul 15 at 12:44
    
possible duplicate of How to recover root user –  Warren Hill Jul 15 at 12:49
    
@Pandya shantanu is already my default user. Why should i run adduser?? Output: adduser: The user `shantanu' already exists. –  shantanu Jul 15 at 13:09
    
Were there any errors when you ran usermod -G sudo shantanu from the recovery console? Did you remember to remount the filesystem with read-write permissions first? FYI you should use -aG else it will remove you from all other secondary groups (or use gpasswd --add shantanu sudo instead - it's safer). –  steeldriver Jul 15 at 13:19
    
@steeldriver usermod returns no error. Yes i remount the filesystem. I also tried -aG option. I didn't gpasswd, is it really safe? My my current user is pretty important. I don't want to mess it up right now. –  shantanu Jul 15 at 13:28
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1 Answer 1

Finally I solved it using gnome-system-tools

enter image description here

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