I reran the command today in X instead of from the VT and I saw some
error about "no known mirror".  I thought of "proxy" but what is meant
is "official Ubuntu repository", I guess.  My deb lines look like this

deb http://u.cname.leggewie.org/ubuntu precise main restricted universe
multiverse

u.cname.leggewie.org is a CNAME for jp.archive.ubuntu.com.  I do this so
that I can have u.cname.leggewie.org be that CNAME "out in the wild" but
have it point to my local apt-cacher-ng repository automatically by the
local DNS in my home LAN.

Suggested fixes:
1) Try to resolve to an IP level or otherwise determine if the host is an 
official Ubuntu Mirror
2) at least improve the wording from "No known mirror" to something along the 
lines of "None of your repositories in sources.list were recognized as official 
Ubuntu mirrors"

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https://bugs.launchpad.net/bugs/1291262

Title:
  do-release-upgrade gives up too easily on 404 error

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