Password field of login screen is disabled

I'm using ubuntu 14.04, here in the 'login screen' the password field is disabled, this issue also occurs sometimes during 'lock screen'. I don't want to remove password from my account nor do i want auto login. My account is with administrator privileges.

Going to terminal using Control + Alt + F1, then back to GUI with Control + Alt + F7, doesn't enables the password field.

Solution 1:

I'm having the exact same issue. Edit: Looks like this is a confirmed bug: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1311316

Solution 2:

I was having the same issue and went to the terminal via Control + Alt + F1, logged in through terminal, then executed the unity command, then went back to the GUI with Control + Alt + F7 and my system resumed to where I had left it. No restart required.