[xubuntu] Login issues on xubuntu 12.04 live usb

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http://ubuntuforums.org – Hi there. Well im really new on xubuntu, starting using it since my hdd died, im using a live usb to run some programs and general stuff (like homework and web browsing) Well the matter is that, normally, when i run xubuntu it doesnt ask me for password or username it just starts normally, but now, for some reason that i dont know it suddenly ask me to put an username and a password that i dont know. This is the 2nd time, the first time i wasn't able to login and i had to re-install xubuntu from 0 on my usb. now for that reason I already dissabled the option to ask for the password when lo (Hardware)