Comment 6 for bug 922949

It doesn't actually have anything directly to do with "install updates during install". This isn't downloading updates, it's downloading language packs.

Checking package checksums is supposed to be apt's responsibility, not ubiquity's. apt normally *does* check the checksum, and in my tests a proxy that deliberately corrupts packages on the way through causes an exception to be raised, which at worst ought to cause ubiquity to display an error message but continue largely normally. This isn't happening in the cases in this bug and its duplicates. Rather than adding another layer of error checking which duplicates a layer of error checking that's supposed to be there already, I would like to figure out why the current layer of error checking isn't working.