another login loop problem

Thanks to the help of terdon, the output of grep -H PATH ~/.profile revealed the login-loop problem:

~/.profile:PATH=/usr/local/bin

instead it should've been:

~/.profile:PATH=/usr/local/bin:$PATH

@terdon, @Braiam: Thanks a lot for your help!

Same problem occurred to me so what I did was opened TTL through ctrl+Alt+F1

Then in the terminal enter hostname and password then cat .xsession-errors you will find errors.

In my case, I made some changes on PATH variable file /etc/environment so removing my changes helped me.

Changing .profile or /etc/environment may result in the problem.