Re: Breaking out of menu on "live disk", repairing grub

[Felix Miata]

On 2013-03-25 12:15 (GMT+0400) Andrey Borzenkov composed:

> Simon Hobson wrote:

> > back in Grub 1 days, I could remember how to install grub just by mounting the 
> > filesystem, chrooting to it, and issuing a few grub commands. I've never 
> > managed to make this work with 1.99 (as currently installed with Debian). Is 
> > there a simple set of commands that will do what worked in grub 1 (going form 
> > memory here) :
> > hd0 = /dev/sda
> > root = (hd0,0)
> > install (hd0)

> mkdir /sysroot
> mount /dev/your-root-dev /sysroot
> mount /dev/your-boot-dev /sysroot/boot
> mount --bind /dev /sysroot/dev
> mount --bind /sys /sysroot/sys
> mount --bind /proc /sysroot/proc
> mount --bind /run /sysroot/run (recommended if you are using systemd)
> chroot /sysroot
> grub-install /dev/your-grub-boot-device (may be grub2-install on some distro)

Lots more to remember than what I do with Grub Legacy:

# grub                          # if booted to live media, or if in a Grub 
menu, just
<ESC>[OK]                 # exit Grub's menu to Grub Shell
grub> find /boot/grub/stage1 # ensure knowledge of Grub files location
grub> root (hd0,2)           # e.g. in this case third partition on first HD
grub> setup (hd0,2)          # installs to partition where Grub files are
grub> reboot                 # just want boot using newly installed Grub, or
grub> quit			# go back to shell for unrelated reasons, since already done, 
and without needing to mount anything not already mounted before starting up 
Grub Shell
--
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/