Comment 22 for bug 146943

These are the uncommented lines in my sources.list
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deb http://tw.archive.ubuntu.com/ubuntu/ gutsy main restricted multiverse universe
deb http://tw.archive.ubuntu.com/ubuntu/ gutsy-updates main restricted multiverse universe
deb http://tw.archive.ubuntu.com/ubuntu/ gutsy-security main restricted multiverse universe
deb http://tw.archive.ubuntu.com/ubuntu/ gutsy-backports main restricted multiverse universe
deb http://archive.canonical.com/ubuntu gutsy partner
deb http://archive.ubuntu.com/ubuntu/ gutsy-proposed restricted main multiverse universe
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I started the upgrade on 16th at around 9pm singapore time (1pm GMT). As you say, perhaps the taiwan mirror wasn't yet in sync. But then again, the versions of the deb files in the apt cache match those you gave in your steps above.

I can't carry out the steps you suggested since running 'dpkg -i' on any package gives me this error:
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 dpkg: parse error, in file `/var/lib/dpkg/updates/0003' near line 2 package `libc6':
 `triggers-pendi' is not allowed for third (status) word in `status' field
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Do you think there's some way I can force a package install without worrying about the pending libc6 package? Or roll-back that libc6 upgrade? Or even manually extract the relevant bits from python-central*.deb, python-apt*deb & dpkg*deb and overwrite the filesystem with contents from those packages?