This isn’t homework, this is on my personal machine. I’m taking a Linux system administration class and the teacher told us about the /etc/nologin file. So without thinking I tried it out on my personal computer and created the file and logged out. But now I can’t sign in with my user or root account. How can I fix this?
That was a pretty stupid thing to do then, wasn’t it? 
Boot up from the live medium that you used for installing the system, mount your on-disk root filesystem into the tree somewhere ─ e.g. at /mnt ─ and delete the file again from there.
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Thank you so much it worked! And yes it was a pretty stupid thing to do
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