9.10 -> 10.04 の do-release-upgrade でエラー

こんなん出た。

An unresolvable problem occurred while calculating the upgrade:
The package 'ubuntu-desktop' is marked for removal but it is in the
removal blacklist.

で、ubuntu-desktopを消しちゃおうかどうしようか迷っていたのだけど、https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/509924

Aslan Gencer  wrote on 2010-04-30:

This workaround worked for me:
Remove ubuntu-desktop with "apt-get remove ubuntu-desktop".
(You'd probably need to do this while you are in a non-gnome desktop.)
Then run the upgrade. ubuntu-desktop can be installed after the upgrade.

と書いてあったので、一旦消してみたら進んだ。