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Installing grub2 fails on my system (10.4 64Bit) with:

/usr/sbin/grub-probe: error: cannot find a GRUB drive for /dev/sdaq1.  
 Check your

Checking, it only lists hd0 to hd25 corresponding to sda to sdz. Recreating the device map produces the same result. How do I get grub to recognize /dev/sdaq1.

Note: The machine has many, many devices; sdaq is the correct drive.

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You need to patch grub-installer.

See bug report 776633 for a patch:

Index: grub-installer-1.60ubuntu3/grub-installer
--- grub-installer-1.60ubuntu3.orig/grub-installer  2011-05-03 12:00:57.553509999 -0700
+++ grub-installer-1.60ubuntu3/grub-installer   2011-05-03 12:04:02.873000831 -0700
@@ -286,7 +286,7 @@
-    /dev/[hsv]d[a-z]|/dev/xvd[a-z]|/dev/cciss/c[0-9]d[0-9]*|/dev/ida/c[0-9]d[0-9]*|/dev/rs/c[0-9]d[0-9]*|/dev/mmcblk[0-9]|/dev/ad[0-9]*|/dev/da[0-9]*)
+    /dev/[hsv]d[a-z]|/dev/[sv]d[a-z][a-z]|/dev/[sv]d[a-z][a-z][a-z]|/dev/xvd[a-z]|/dev/cciss/c[0-9]d[0-9]*|/dev/ida/c[0-9]d[0-9]*|/dev/rs/c[0-9]d[0-9]*|/dev/mmcblk[0-9]|/dev/ad[0-9]*|/dev/da[0-9]*)

grub-installer is probably not on your system (since after it's in installed there's not really need for it to stay ;) ). This is the package it concerns: so you'll probably find it on the install medium...

Here's a quick how to on remastering your own CD: How can I easily remaster Ubuntu?

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Sounds like the right direction. I'm however not sure how to apply the patch: I tried to install grub2 with apt-get install and there does not seem to be a file with name grub-installer on my system when doing this. – user7054 Jun 16 '11 at 5:02
Thanks for the additional info. In my case the problem occurred during a kernel upgrade, not a new installation, on a system that has a lot of staff installed and is running in a semi-production environment. So, I'd rather not do a re-install if at all possible. – user7054 Jun 17 '11 at 0:31

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