there was apparently two different kernels on the system !?
Did an :
apt-get remove linux-image-2.6.27-15-generic
apt-get -f install
After that it was OK, but what kernel packages should be there ?
dpkg -l |grep linux-image-
ii linux-image-2.6.27-14-generic 2.6.27-14.41 Linux kernel image for version 2.6.27 on x86
rc linux-image-2.6.27-15-generic 2.6.27-15.43 Linux kernel image for version 2.6.27 on x86
ii linux-image-diskless 2.6.27-15-generic-lmce1 Linux kernel image for version 2.6.27-15-gen
is the "linux-image-2.6.27-14-generic" not supposed to be there ?