I just undeliberately deleted my bin/tempfile, please don't ask why.
I experienced no issues, however, after a reboot, I wasn't able to login anymore. When I entered my password and pressed ENTER, I got a black screen, and 2 seconds later the login screen appeared again.
My system is Kubuntu 17.10 on 4.14.11 Kernel.
I did some research on it, but I still got no clue what this file does, or how I can restore it (it was deleted by rm).
Until now I did the following:
touch /bin/tempfile chown root:root /bin/tempfilechmod 755 /bin/tempfileFinally I got back into KDE, and everything works fine this far, except an error, which I receive immediately after logging in: Xsession: Xsession: Warning: unable to write to ; X session may exit. The message is not in the style of my normal KDE desktop windows, it looks like a very old design, because the message probably comes from X itself. (I have no clue about this, sorry if it's rubbish)
In your case you can easily fix your issue by executing the following command:sudo apt-get --reinstall install debianutils.
Hope this helps.