After rebooting to the 2.6.31-15 kernel, I was able to update-grub and apply the update. Now with kernel -17 everything works also. So it seems linked to the -16 kernel only, for some reason.
After rebooting to the 2.6.31-15 kernel, I was able to update-grub and apply the update. Now with kernel -17 everything works also. So it seems linked to the -16 kernel only, for some reason.