Bug#518791:

[Debian]

> Known problem, see #497791, #512787 and #514673.
> You need to run `grub-install /dev/sda' to really update grub2.

Please tell me how you will run grub-install when the system is not booting?

That is not a sufficent answer - even for this problem nor for the problems with
grub 1.96!

I can only boot knoppix and a grub-install will install the grub used by knoppix!
There is no chance to get a running grub.cfg again.
And i don't understand how to edit it manually.
The syntax with this suspect ID's is not understandible.
Grub 1.96 looks like made by Microsoft!