I was watching something on the computer last night and after 1 hour the screen locked (which I set it to do). Now all of a sudden my password is not working and I can't login. I have another account on the same computer that works fine, but I cannot log in to my account. Why did this happen and what can I do?
I'm a newbie to Ubuntu (indeed any Linux distro), forgive me for any poorly connected dots!
I recently encountered this too, seemed odd as I hadn't changed anything (intentionally). I'd been away for a few minutes and had to unlock the user again. It wouldn't work but it had less than 10 minutes before. I tried it a few times and was confident I was using the correct password.
I jumped into a guest account to check out AskUbuntu and found your question. I was about to give prakharsingh95's answer a go but for sanity's sake I tried typing the password as visible text and it seemed fine. I then tried to unlock again and it allowed me in.
I was a little confused but then I noticed my default language had changed from EN1 to EN2. This was the problem because of one of the characters in my password maps differently between the keyboard layouts. I'm guessing that using the guest account reset the language before I attempted to unlock again. I did a little more reading and came across this with a few answers Keyboard layout switches to English each time I reboot. For now I'm attempting the most popular answer but it also helped me come across what I believe was the culprit in my case. Super+Space will change to the next layout. I probably inadvertently did this after first logging on.
Hopefully this will be useful to anyone else in the same situation.