[ubuntu-uk] Peer to peer apt

[Michael Holmes]

I can see a few problems with this:

* If it comes turned off by default, then most people won't be
distributing the upgrades.
* If it is turned on by default, people with caps will quickly max
out, and most ill turn it off, going back to problem one.
* Less popuar packages will heve little to no "seeds" to distribute
them, and so will be snail-slow or even uninstallable.
* Issue of trust: how do we know these updates are authentic? (though
this could easily be solved via per-package signing)
* Propagation of updates will be problematic - as everyone rushes to
update, machines running as seeds will be thinly spreas and not even
other machines set to share will be able to get at a copy.

It'd probably be best to have this augment the existing centralised
repo model rather than go for it out right. Way too many showstoppers.