Boot up my laptop and got and error message
Shutdown the laptop and restart and somehow grub let me boot into Debian.

In Debian, I did a update-grub2 and got this error
Any idea what is wrong here?

I'm not sure but isn't grub2 transitional?
Even though you have grub2 it's grub-pc.
try
"update grub"
if you have sudo configured
"sudo update-grub"

Hi Eddy,

as I've said, grub allows me to boot into Debian so didn't know what's causing the error message on bootup which mysteriously disappeared now.

suspect it's due to the "aptitude upgrade" that I've done earlier on.


anyway, tried what you mentioned "update-grub" and things seems okay,
in fact, "update-grub2" is also okay now.

and I really don't feel good about it, even though everything's working now

EDDY1:

/usr/sbin/update-grub2 is a shell script that executes update-grub
/usr/sbin/update-grub is a shell script that executes grub-mkconfig

hence grub-mkconfig == update-grub == update-grub2

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Now, as to the original error itself, I haven't a clue, yet.
Unfortunately, the grub2 documentation is scarce, but getting better, and even that documentation that does exist becomes more obsolete every time they update grub2.

I would suggest taking a look at http://www.gnu.org/software/grub/ and wading through their documentation for your error, as grub2 is currently a moving target.

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Thanks kevinbenko that's useful information.
That's exactly why I question my answer because I just wasn't sure if update-grub2 was a valid command.