Thank you for reporting this, Richard!
I ran into this exact same error while upgrading to grub-pc
(2.02+dfsg1-12ubuntu2.1) on Ubuntu 19.04. After given choices of
"/dev/sda", "/dev/sda5" and "/dev/sdb", I selected /dev/sda and
/dev/sda5 on the "GRUB Install devices" page, leaving "/dev/sdb"
unchecked. Then this error appears:
Installing for i386-pc platform.
grub-install: error: cannot find a GRUB drive for /,. Check your device.map
and, running "ps auxwww | grep grub" shows this:
grub-install --target=i386-pc --force --no-floppy /,
just as what you have observed!
Thank you for providing the fix too!
I'll try to make merge request of your patch at
https://salsa.debian.org/grub-team/grub
Cheers,
Anthony
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https://bugs.launchpad.net/bugs/1803805
Title:
grub-pc fails to install on the last of multiple devices
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