I cannot install any new packages because of python3-uno dependency problems. Apt-get said that python3-uno depends on libreoffice-core (=1:3.5.7-0ubuntu4) but 1:3.5.7-0ubuntu5 is to be installed. I tried purging libreoffice * with no luck. Now I can open the Libre Office core but cannot make any files because they are all grayed out. How do I fix Libre Office and resolve the python3-uno dependency problems?

EDIT:I forgot to mention I'm running 12.04. Purging python3-uno and libreoffice* did not help. Installing updates on update manager and disabled all of my third party sources (except for the one called third party sources or something like that). Apt-get update did not help either. I'm afraid to upgrade the distribution because last time I tried to I got the black screen when starting up after install error.