Finally I find the cause and the solution Cause: This error hapens when you boot with the old kernel version (Ubuntu 5.10). The Dapper upgrade process does not do the right update in the grub configuration file.
Solution: Fix by hand your grub configuration file to be sure to boot using the right kernel version suitable for Dapper. -- gnome-settings-daemon unable to start on login gnome session https://launchpad.net/bugs/49939 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
