Hi,
Regarding the issue with the wrong password. I got the same issue and figured out there went something wrong with the keybord layout.
During installation i have choosen everything in german. Otherwise you cannot choose your country. Means "installing in english doesn't offer Germany for country". After installation when you are at the x11 login screen keybord layout was not german, otherwise than selected. Verified that by typing my pwd for username. Switching to terminal Strg+Alt+F1....F6 and login on was ok, there the keyboard was ok.
Summa sumarum....keybord layout was ok at terminal and not ok at x11.
Just for your information....
Volker