Public bug reported:
Sometime between June 13, 2011 and the release date of grub-pc
1.99-12ubuntu5 a change was committed to grub2 which prevents it booting
from a USB key on my laptop (Asus M5000).
Using syntax: grub-install /dev/sdb --root-directory=/media/usbdisk
installs successfully, on reboot results in: Bad or missing operating
system, reboot or select valid boot device. The resulting usb key boots
successfuly under virtualbox.
A workaround is possible by chainloading grub from syslinux, although
this is painful.
I have investigated the issue with Jordan_U of #grub on freenode. We
tried a grub-mkrescue image from #4248 without success.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/990888
Title:
grub2 wont boot from USB any more
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