python+GTK+Compiz
 

hi all,

I just upgraded to Gutsy and I was trying to install the Compiz. Every thing seems to be ok until I tried to run the ccsm and I got the following message:

talavera@talavera-laptop1:~$ ccsm
Traceback (most recent call last):
File "/usr/bin/ccsm", line 24, in <module>
import gtk
File "/var/lib/python-support/python2.5/gtk-2.0/gtk/__init__.py", line 48, in <module>
from gtk import _gtk
ImportError: /usr/lib/libcairo.so.2: symbol png_set_expand_gray_1_2_4_to_8, version PNG12_0 not defined in file libpng12.so.0 with link time reference

After some walking around the problem and by coincidence I ran the pygtk-demo command and I got exactly the same error.

Please, could you help me with this? I do not what else to do ???

Sometimes this still happens
 

Well, years later I got the same error but with python 2.6 running.

The problem was that I had two versions of libpng12 installed. One was quite old, from an installation of lightscribe simple labeler. The system loaded it when I started update-manager and immediately died. Starting it from the command line gave the relevant error.
FIX: I edited /etc/ld.so.d/libc.conf to add /lib and /usr/lib then ran sudo ldconfig. update-manager instantly started working again. I could also have disabled or deleted the lightscribeApplications.conf in ld.so.d but then lightscribe may not work. Hope this helps someone.
Mike