I was trying to install Stickynotes in ubuntu then i have this problem, how can i solve this problem ?

me:~$ sudo add-pt-repository ppa:umang/indivator-stickynotes
sudo: /etc/sudoers is world writable
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin

marked as duplicate by karel, Pilot6, Charles Green, Eric Carvalho, K7AAY Feb 15 at 23:01

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