Unstable, LVM and Grub2: "error: you need to load the kernel first"

[Johannes Graumann <johannes_graumann@web.de>]

Hello,

A recent update of both my home machines running sid pulled in an update of 
grub2. Now both machines are stuck with the grub menu showing up fine, but 
no matter which kernel I choose, I always end up with this error:

"error: you need to load the kernel first"

Does anyone here have an idea what might be going wrong and how to fix it? 

Thanks for any hints, 

Sincerely, Joh