Comment 3 for bug 855042

Looking at the syslog it may be relevant, that this is a German installation.
I see:

Sep 20 23:07:17 ubuntu ubiquity: Bitte 'j' oder 'n' eingeben und Enter drücken
Sep 20 21:07:18 ubiquity: last message repeated 78 times

Maybe someone somewhere is passing a non-localized 'y' for 'yes' and someone else is expecting a localized 'j' (Ja for yes). Attaching syslog and debug log from ubiquity. This should have more info that the previous logs.