I am trying to run gkSudo. This is my second day as a linux user.

Yesterday I could do

gksudo gedit

and input my root password fine.

Today, when I run that, the GUI comes up and asked for my password, however then the program fails to run and all I get is:

(gksudo:3262): GLib-CRITICAL **: g_str_has_prefix: assertion `str != NULL' failed

I cannot sudo, I cannot su, I can't do anything. I am trying to add myself to the sudoers file but I can't even view it without being root. What can I do?

  • what you did from yesterday :) ??
    – Web-E
    Nov 16, 2012 at 12:06
  • what is the output of sudo gedit, for example?
    – Salem
    Nov 16, 2012 at 13:48
  • Out sounds like you messed up your sudoers file, please follow the steps here to repair your sudo. Jan 16, 2013 at 12:17
  • welcome to linux. I'm glad to see we can provide a consistent user experience. If all goes well, you should be able to enjoy a new bug every day...
    – user77164
    Nov 18, 2013 at 2:39

1 Answer 1


I don't think this is a problem with your sudoers file. There are other reports of a similar bug in the debian bugtracker.

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