Yes I know that I need rootsh.
But I can't deinstall it! I tried everything you said...

I tried this:
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sudo gainroot

1. apt-get install --reinstall hildon-desktop
or
2.apt-get upgrade

-> it doesnt ask me if i want install old hildon-desktop...
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root
apt-get install --reinstall hildon-desktop
killall hildon-desktop
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After this operations I rebootet my device more than 1 time and the Desktop is still rotating...

I want to deinstall it because it causes problems with indexing of media files... I noticed that afer installation of hildon desktop portrait mode.