sorry nogmaals
dirk@ubuntu:~$ software-center
Traceback (most recent call last):
File "/usr/bin/software-center", line 31, in <module>
from gi.repository import GObject
File "/usr/lib/python2.7/dist-packages/gi/__init__.py", line 23, in <module>
ImportError: /usr/lib/python2.7/dist-packages/gi/_gi.so: invalid ELF header
dirk@ubuntu:~$