Check if you are using third party repositories. If so disable them, since they are a common source of problems. Furthermore run the following command in a Terminal: apt-get install -f
Egiaztatu hirugarrengoen errepositorioak darabiltzazun. Hala bada, ezgaitu itzazu, arazoak ekarri ohi dituzte eta. Honez gain, exekutatu agindu hau terminal batean: apt-get install -f