Comment 6 for bug 716479

I think the reason it broke is because APT thought it was talking to the target archive, while it was talking to some corporate proxy returning other files which broke the indices. Would you pull your network cable out, it would work :-) Also, the main issue for this person is the lack of proxy support, we don't setup the proxy in the target to be the same as on the host; bug #673570.

While hwpacks might be enough to have all packages, they might also not be enough; for instance, we might want to install btrfs-tools if your rootfs lacks it, or add missing dependencies.

I'll take it that it would be useful if we supported 100% offline.