I found an hack, if you doesn't want to uninstall and perhaps loose settings:
Its dirty, but it worked.

I did that in the shell with sudo do-release-upgrade
I attached strace  till the error cames out then and then I stopped it.
I checked the log file from strace and found out, that
a file was created: /tmp/<folder_with_random_chars>/removal_blacklist.cfg

So I let it restore to the old state, cleared the tmp folder,
restarted the tool and quick removed the *untu-dektop entries in the file 
removal_blacklist.cfg (there is then only one folder with random charas only in 
the tem dir), and saved.  
i recommend  vim because you can go quick in then type "d6d" (i think there are 
6 lines) in command mode type :x and its saved.
I needed two runs, so you have to be quite fast till the updater reads the file.

-- 
system upgrade 9.10 --> 10.04 could not calculate upgrade when both 
xubuntu-desktop and ubuntu-desktop are installed
https://bugs.launchpad.net/bugs/571743
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