Problems with repositories

Hi,

I using Zorin for about a year. Only problem that I am unable to sort is updating by terminal. After few months of using the system, terminal showing communicate: "repository unable to read" or something similar, don`t remember exactly, I reinstalling system every time when problem happens. Can you help me, how to resolve these problem, please?

The next time this happens, please copy and paste the terminal output.
Without knowing for sure, the members here may not want to lead you on a wild goosechase.
It sounds, most likely, like a repository in your sources needs to be removed.

Posts split.