Package: apt Severity: wishlist
It would be nice if there were a way to specify in /etc/apt/sources.list that if some specified place to get some chunk of packages is down or doesn't have a package even through its Packages file says it does or some other problem crops up, apt should attempt to fetch the desired stuff from some other specified fallback site before actually giving up. This would avoid the current necessity of editing /etc/apt/sources.list to eg switch which of three putatively identical mirrors is accessed when one's favorite mirror goes down and again when it comes back up.
