su wont work, cant "su root" as a normal user
//lukeorun@luke:~$ su root
//Password:
//su: Authentication failure
//Sorry.
i used to be ably to do this when i ssh:a to my computer but now it wont work.
i did a huge misstake a couple of days ago, and change ownerships of some files when i was root, after that the normal user cant use the command "su"
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