I'm trying to install Sticky Notes in Ubuntu 16.04 but I get some errors

Question

pankaj@pankajbhatt:~$ sudo add-apt-repository ppa:umang/indicator-stickynotes
>>> /etc/sudoers: syntax error near line 1 <<<
sudo: parse error in /etc/sudoers near line 1
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin
pankaj@pankajbhatt:~$ 

Answer 1

Have you altered /etc/sudoers? It's complaining that there's a "syntax error" in or near the first line of /etc/sudoers. Undo your changes to /etc/sudoers.