[TYPO3] Debian - GDlib not found

[PEF]

Hi.

My GDlib has disappeared. The install module of Typo3 says that GDlib is 
not installed.

I've installed these packages:
- apt-get install libgd2 php4-gd2 freetype2

... and restartet apache

When I look in /var/lib/ i get this:
libgd.so.2 -> libgd.so.2.0.33
libgd.so.2.0.33

Yesterday - because of rendering differences - I tried to update libgd. 
So the day before yesterday it works well. For your information, the 
error first occurs this morning (monday) dispite the fact, that the 
update-trial was done saturday or sunday.

Can anyone tell me what's wrong?

Regards
Peter