Re: Upgrade from 12.04 to 12.10 - left with blank screen
It sounds like the upgrade went wrong somehow. I have tried to upgrade three times with various versions of Ubuntu and Lubuntu and each time the upgrade failed. I was forced to re-install. Fortunately, I had backed up my data so nothing was lost. Others upgrade without a problem. Did you back up your data? If yes I would opt for a fresh install. However, 12.10 doesn't have a whole lot of life left (EOL in April) and 13.04 is only supported for nine months, it might be better to install Lubuntu 13.10 while you await the long anticipated release of Lubuntu 14.04 which will finally be a LTS version.
ASUS EeePC 1000h with Lubuntu 14.04
Dell Inspiron 1000 with Lubuntu 14.04