i had ubuntu 12.10 on my mini alongside (dual boot alongside windows bc i didnt know how to completely remove windows). i tried to upgrade to 13.04 and thought it didnt work because i got error messages, but apparently it did and now my mini is acting very strange. i can't turn the sound on (though i hear sound through headphones) it's incredibly slow, it slows almost to a complete stop or crashes every time i open the software updater, etc.
what should i do? i wouldn't mind going back to 12.10 but i don't know how to.
i'm not very well-versed in this kind of stuff so maybe kindly phrase your answers very very new-comer level please. thanks a lot