[Typo3-debian] Strange "Zero Sized Reply"

[chriss at alt-sachsenhausen.org]

Hello,

when I  "click" on "Basic Configuration" in the "TYPO3 3.5.0 Install Tool" I
geht a error message from the browser: "Zero Sized Reply" 
And tons of:
[...]
libpng warning: Application was compiled with png.h from libpng-1.2.5
libpng warning: Application is running with png.h from libpng-1.0.5
gd-png: fatal libpng error: Incomatible libpng version in application and
library
[Sat May 31 20:16:27 2003] [notice] cild pid 9057 exit signal Segmentation
fault (11)
[...]

apt-show-version | grep libpng 
libpng10-0/testing uptodate 1.0.15-3
libpng2/testing uptodate 1.0.15-3
libpng12-0/testing uptodate 1.2.5.0-3

Can someone help me, please?

Regards,

Chriss