Comment 4 for bug 428089

rv@ubuntu:~$ sudo DEBCONF_DEBUG=developer /var/lib/dpkg/info/grub-pc.postinst configure 1.97~beta2-2ubuntu1
debconf (developer): frontend started
debconf (developer): frontend running, package name is grub-pc
debconf (developer): starting /var/lib/dpkg/info/grub-pc.config configure 1.97~beta2-2ubuntu1
debconf (developer): <-- INPUT high grub-pc/chainload_from_menu.lst
debconf (developer): --> 30 question skipped
debconf (developer): <-- GET grub-pc/kopt_extracted
debconf (developer): --> 0 true
debconf (developer): <-- SET grub2/linux_cmdline
debconf (developer): --> 0 value set
debconf (developer): <-- SET grub2/linux_cmdline_default quiet splash
debconf (developer): --> 0 value set
debconf (developer): <-- SET grub-pc/timeout 10
debconf (developer): --> 0 value set
debconf (developer): <-- SET grub-pc/hidden_timeout false
debconf (developer): --> 0 value set
debconf (developer): <-- INPUT high grub2/linux_cmdline
debconf (developer): --> 30 question skipped
debconf (developer): <-- INPUT high grub2/linux_cmdline_default
debconf (developer): --> 30 question skipped
debconf (developer): <-- GO
debconf (developer): --> 0 ok
debconf (developer): starting /var/lib/dpkg/info/grub-pc.postinst configure 1.97~beta2-2ubuntu1
debconf (developer): <-- GET grub2/linux_cmdline
debconf (developer): --> 0
debconf (developer): <-- GET grub2/linux_cmdline_default
debconf (developer): --> 0 quiet splash
debconf (developer): <-- GET grub-pc/timeout
debconf (developer): --> 0 10
debconf (developer): <-- GET grub-pc/hidden_timeout
debconf (developer): --> 0 false
debconf (developer): <-- X_LOADTEMPLATEFILE /var/lib/dpkg/info/ucf.templates ucf
debconf (developer): --> 0
debconf (developer): <-- GET grub-pc/chainload_from_menu.lst
debconf (developer): --> 0 true
Generating core.img
grub-probe: error: no mapping exists for `nvidia_bhifdadh1'
Auto-detection of a filesystem module failed.
Please specify the module with the option `--modules' explicitly.