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There is not enough context in your question for us to be able to answer it. Permission for what? Which Atlassian application? Is this ec2-user a human or a service account of some sort? Where is "unable to initialise policy plugin" coming from? What app is the "policy plugin"?
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
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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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