Debian 9 Log In Failure With Correct Password


Well today for the first time, I couldn't login with my users correct password. There could be several things causing this, but here is what I did to solve it.

I entered into terminal mode, typing:


Entering the users correct password, then I changed the password to a brand new one.

This solved the issue for me, but there are other things that can cause this, so I will list other solutions here below.

Another solution, when for some reason, the / tmp dir changed.

Restart the computer and press down CTRL+ALT+F3, login using the terminal mode, enter username + password.

Then type:

chmod 1777 /tmp

Press Enter, done.

Go back with CTRL+ALT+F7

To look for errors in ~/.xsession_errors and /var/log/Xorg.0.log.

CTRL+ALT+F1, log in to the terminal as su, enter the password for root and open the files using nano.

Errors in .profile, .bash_profile, /etc/profile, or .bashrc making the shell exit.

CTRL+ALT+F1, log in to the terminal as su, enter the password for root and open the files using nano.

Root folder is 100% full?

Then type:

sudo apt-get clean

Press Enter, done.

syntax error in /etc/X11/xorg.conf. ?

Issue the command:


Press Enter.

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