12.04keyboard-layoutlanguagelightdm
I upgraded to 12.04 and now I can't log in because Ubuntu only allows Russian keyboard layout at login, but my password has Latin letters in it. Guest session works, and allows other languages, but I can't log in on my main account. What to do?
On Ubuntu 11.10 I used to have Swedish as default language and Russian as secondary. The first login on 12.04 worked fine, but not any more.
Did you try the hotkey for switching keyboard-language (shift+shiftlock) on loginscreen already? If SE is installed it may work.
If your changes are not effective for the login screen too, you have probably more than one user account on the system. But in that case, the Settings -> Region & Language window includes a "Login Screen" button. Clicking that button switches the mode, so you can control the login screen values separately.
Best Answer
After upgrade to 12.04 I had the exact same issue. Prior to upgrade, Greek (Polytonic) and Finnish keyboard layouts were available. After upgrade, LightDM only showed Greek (Polytonic), which prevented logging in.
I worked around this by changing the password from the virtual terminal (Ctrl-Alt-F1) by logging in and using
passwdto change my password to numeric one as suggested by ggis. Then, when logged in to Unity, I reset keyboard layouts to default, re-added Greek and Finnish layouts and ordered them properly. After a few tries, I got Finnish to show up in LightDM.