This question already has an answer here:
I had previous problems like this, first it did not want to update anything. It always sad:
Failed to download repository information check your internet connection,
but i have internet connection and i discovered just to uncheck the PPA packadges that caused the problem and i successfully update all my software. After that a exclamation mark in triangular sign appeard next to Wifi icon that says:
The update information is outdated. This may be caused by network problems or by a repository that is no longer available. Please update manually by selecting 'Show updates' from the indicator menu, and watching for any failing repositories.
After clicking on that it says your software is up to date, but when i try to press update it's checking for cache and says, as always, FAILED TO DOWNLOAD REPOSITORY INFORMATION CHECK YOUR INTERNET CONNECTION.
Is this problem with a wirelles driver, or some packadges that needs to be removed? Solutions? Suggestions?