Workaround “/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?)” on diskless Ubuntu

When trying to “aptitude upgrade” a diskless Ubuntu 10.04 machine I gen an arror:

update-initramfs: Generating /boot/initrd.img-2.6.32-23-generic
Running postinst hook script /usr/sbin/update-grub.
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
User postinst hook script [/usr/sbin/update-grub] exited with value 1
dpkg: error processing linux-image-2.6.32-23-generic (--configure):
 subprocess installed post-installation script returned error exit status 1

It means that grub cannot write a MBR to the disk. But… I don’t have a disk! So I don’t need grub at all. And I don’t need a Linux kernel either because it is loaded from a tftp server!

So the simplest workaround-solution is just to remove these packages:

• linux-image-2.6.xx-xx-generic (x = any number)
• linux-image-generic
• linux-generic
• grub-pc
• grub-common

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