Ubuntu failed to upgrade

Ubuntu failed to upgrade

So i was trying to upgrade ubuntu.. and what i did was that i used the
update manager to upgrade it for me. i had the LTS version ans i was
trying to upgrade it to 12.10 so when i started the upgrade i closed all
the programs and started to upgrade and everything went well until the
installing process. it was like fail to install this package a couple of
times and then i displayed that an error occurred and that ubuntu needs to
fix and that it wil run a recovery but it didnt and when i turned off the
computer and turned it back on and tried to run ubuntu first i get the
normal purple/pink starting color with nothing going on and then the
screen flashes and goes dark then it just lights up but its black.. hope
someone can help me fix this and sorry for the weird long explanation