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I run my ubuntu 16.04 for my plex media server host. Yesterday I've done a plex update as I've allways done. Today I wanted to install the todays update and suddenly I get welcomed by "is not in the sudoers file" https://snag.gy/URMnj8.jpg

This VM has never seen anything else than plex and netdata. I've done a VM restart to no better result.

Any idea how I can get it back?

Thanks

In0cenT
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    By default, users are "in the sudoers file" either explicitly, by username, or by their membership in the sudo group (id will show which groups you're in). Check the modification times of /etc/groups, /etc/sudoers, /etc/sudoers.d/*. diff /etc/group /etc/group-. See what has changed. – waltinator May 23 '17 at 17:29
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    See also How do I add myself back as a sudo user? – steeldriver May 23 '17 at 17:30
  • Thanks, I got it to work with recovery mode, how was I ment to check what has changed in the files suggested by waltinator? Just to know...

    Is there any way to find out how this happend?

    Thanks!

     – In0cenT May 23 '17 at 18:46

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