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So recently I accidentally started changing all the permissions in root to my unprivileged account :(. It happened because I was switching between users and shells and the directory changed to / without me noticing. Luckily I had -c enabled so I realised there was something wrong quite quickly(just after the home dir). I then ran chown root:root -R (all files owned by me in /) Now I'm having problems with xscreensaver and su'ing reurns failed auth. I can still use sudo though. Is there any maybe a list of permissions somewhere? I'm running the latest Mint XFCE.

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    And you are running Mint or Ubuntu? – user103789 Nov 24 '15 at 20:46
  • @ParanoidPanda Mint. I updated the question – Wilhelm Erasmus Nov 24 '15 at 21:56
  • Well , since you recursively chowned everything, you also have chowned everything in your home . . . .Do chown -R yourUsername:yourUsername /home/yourUsername to get your stuff back to your ownership – Sergiy Kolodyazhnyy Nov 24 '15 at 22:07
  • @Serg The problem is that most of the root filesystem was owned by me instead of root. I was attempting to do chown -R yourUsername:yourUsername ./ but I was in / not ~ – Wilhelm Erasmus Nov 24 '15 at 22:14
  • Oh, I see. Changing ownership of everything on the filesystem back to root user will be the easiest next to reinstalling. But there are many direcotries in files , such as /etc/shadow or /etc/mtab.fuselock that have different group ownership, so if you chown everything to root recursivelly you still have to go back and fix many other files. – Sergiy Kolodyazhnyy Nov 24 '15 at 22:21
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This is pretty much an "+++ Out of Cheese Error. Redo From Start. +++" situation.

Lots of files down in the guts run as different users/groups and while most things can live as "root:root" if this is going to be a long running system you're better off backing up /home and repaving.

Alternatively find another computer, install virtual box, install mint, and then run:

find ./ | xargs ls -lth | awk ' { print $1"\t"$3":"$4" "$NF } ' > /var/tmp/perms.

You should then be able to copy perms over to your mint computer, and write a script that reads that file and sets the right user/group ownership.

Actually, that would be a good penance as well as a useful technical exercise. :)

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I found the simplest method of fixing all the permissions. https://serverfault.com/a/117149/191095

getfacl -R / > /root/perms.acl
setfacl --restore=/root/perms.acl

It works perfectly. Now my xscreensaver and logging in as root work again :-)

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