When I was given the option to Upgrade to Ubuntu 12.10 I did try to Upgrade, but while it was upgrading the internet connection was lost and the system went through a partial upgrade.
Now when I try to open the Update Manager or the Software Sources it opens and crashes automatically.
What should I do?
When package upgrades are interrupted in midway, normally doing
sudo dpkg --configure -a && sudo apt-get -f install && sudo apt-get upgradewill save the situation, but when is a full release upgrade (jumping from a version to another) the steps becomes more tricky.
What's the best solution for this cases? Reinstall. If you are not capable to reinstall, you may want to continue the upgrade using
sudo apt-get dist-upgrade(the last one you shall modify your
sources.listfrom oneiric to precise, see my command at the end), but that I won't guarantee will work. Other option is
sudo do-releases-upgrade, but you must make sure that the process is not interrupted this time around.