Comment 0 for bug 1530809

Recently I updated my perfectly working linux Mint 17.2 to 17.3 (both cinnamon 64 bit), due to enjoy these new features making work easier. Ever since I can't update my software. There's popping up a warning, which says to switch to another linux mint mirror because of a damaged ATP-cache. Living in Germany I tried almost every mirror of my country, even some of the Netherlands and Czech Republic. But it doesn't work and the warning comes again. Even the reset to the original mirrors doesn't work.
What can I do to get the latest updates again, how can I fix this problem?