[ubuntu] Xerus upgrade, caot update: failed to download repository

I upgraded to Xerus no problem, no with updates I get a red triangle with an exclamation ! telling me the update information is outdated due to network problems or repository is no longer available. Then when I do try to update I get this message: failed to download repository information (check your coection).

My coection is fine, sometimes I'll check and it says my system is up to date. I do get the gray screen a lot since I upgraded. Trusty Tahr LTS was so great I never had problems.ugh

Not very technically inclined so please help!
Rory