sudo: parse error in /etc/sudoers near line 21 sudo: no valid sudoers sources found, quitting sudo: unable to initialize policy plugin
this is my full question about this
This has nothing to do with Atlassian stuff, so you are asking in the wrong place.
But, it's not hard to see what is wrong - the error message you've posted is clear that your /etc/sudoers file is incorrectly written or corrupt.
You need to edit that file and correct the errors in it.
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