i had a quick look into the source code. The following line in
DistUpgrade/DistUpgradeConfigParser.py:
print c.getListFromFile("Sources","ValidMirrors")
suggests that my initial guess was right. (I have not verified the
following carefully - it is just an assumption, but a very likely one)
The update-manager searches in sources.list for a known mirror and then
does not find one because my mirror is not listed in
DistUpgrade/mirrors.cfg. Then it uses a default value
(archive.ubuntu.com main). As it is a very common situation to have a
local linux / ubuntu mirror at a university to limit the incoming
traffic, this should probably be improved.
--
restricted component lost from sources.list during upgrade
https://launchpad.net/bugs/68467
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