[gentoo-user] redoing grub-2 after emerge updates it

[Harry Putnam]

Googling to find out if it is necessary to reinstall the bootloader
and update grub.cfg afer update world installed grub2 update.

I was buried in directions to install grub2, or move from old grub to
grub2.  But not what I wanted to know short of reading all hits word
for word.

So, (sniveling over), do I need to reinstall the boot loader and
update grub.cfg like when it was newly installed?