A weird thing happened today: I clicked on the terminal icon and it didn't launch – just blinked and disappeared. If I press Ctrl+Alt+T, it won't launch. I tried to launch a light terminal by pressing Ctrl+Alt+F1. The login screen to put my login and password appeared, the system accepted the login and password but quickly returned to the login screen. It's a kind of loop: I enter the login and the system returns to the login screen. Xterm doesn't work too, however Unity seems to work correctly.
It's the first time that the terminal doesn't work, and I don't know how to fix this bug. I would appreciate any kind of help.
UPDATE:
I had installed mysecureshell before the reported issue and, when I removed this package, the problem was partially corrected. The terminal works (xterm too), but the light terminals (tty), accessed by Ctrl+Alt+F1, remain in loop during the login.
Below are pasted my .bashrc and the result of dmesg:
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~/.bashrc: http://paste.ubuntu.com/16918978/
Best Answer
In my case I upgraded python3.5 to python3.6.
For that workaround run
xterm. Then run the following two commands: