Thanks for reply. I installed from experimental repository these packages: - akregator - blogilo - accountwizard - kontact but I have same problem.
After investigation found the problem: $ ls -ll /usr/lib/x86_64-linux-gnu/libGL.* -rw-r--r-- 1 root root 463K giu 19 2011 /usr/lib/x86_64-linux-gnu/libGL.so.1.2 lrwxrwxrwx 1 root root 14 nov 9 11:14 /usr/lib/x86_64-linux-gnu/libGL.so -> libGL.so.1.0.0 lrwxrwxrwx 1 root root 17 nov 9 18:53 /usr/lib/x86_64-linux-gnu/libGL.so.1 -> libGL.so.1.2-orig -rw-r--r-- 1 root root 383K nov 9 18:53 /usr/lib/x86_64-linux-gnu/libGL.so.1.2-orig -rw-r--r-- 1 root root 555K nov 9 18:53 /usr/lib/x86_64-linux-gnu/libGL.so.1.0.0 I removed orphan files: $ rm -f /usr/lib/x86_64-linux-gnu/libGL.so.1.2-orig /usr/lib/x86_64-linux-gnu/libGL.so.1 $ rm -f /usr/lib/x86_64-linux-gnu/libGL.so.1 /usr/lib/x86_64-linux-gnu/libGL.so.1.2 $ ldconfig and these packages: $ apt-get purge libgl1-mesa-glx:amd64 libgl1-mesa-glx:i386 $ ldconfig after: $ ls -ll /usr/lib/x86_64-linux-gnu/libGL.* lrwxrwxrwx 1 root root 14 nov 9 11:14 /usr/lib/x86_64-linux-gnu/libGL.so -> libGL.so.1.0.0 lrwxrwxrwx 1 root root 14 nov 16 07:49 /usr/lib/x86_64-linux-gnu/libGL.so.1 -> libGL.so.1.0.0 -rw-r--r-- 1 root root 567624 nov 9 18:53 /usr/lib/x86_64-linux-gnu/libGL.so.1.0.0 and every application now work.
