Bug#708204: Upgrade fails with "source_dir doesn't exist. Please specify --target or --directory"

[Matt Kraai]

Hi,

Here's a little more information about this bug: grub-yeeloong's
postinst runs grub-install with no arguments.  This causes
grub-install to try to autodetect the target based on the output of
"uname -m".  "uname -m" outputs "mips64" on my Lemote Yeeloong.  This
causes it to match the "mips"* pattern and sets target to "mips-arc".
/usr/lib/grub/mips-arc doesn't exist, so grub-install displays the
aforementioned error and exits.

-- 
Matt