[PLUG] Help! Update won't boot

[John Jason Jordan]

On Wed, 6 Aug 2014 22:20:20 -0700
John Jason Jordan <johnxj at comcast.net> dijo:

>OK, I am booted to the Xubuntu 14.04.1 live DVD. I shows icons on the
>desktop for the various drives and I mounted the one where the OS is
>located (sdb1). With the file manager I can see the /boot folder. And I
>know for certain that this is the right drive and partition because a
>long time ago Keith created /b1 and /b2 at the Clinic and I never
>bothered to remove them, and there they are. 
>
>With sdb1 mounted I navigated to it with a terminal and used ls to
>confirm that I am in the root of my kaput system. My understanding is
>that now I should do dpkg-reconfigure grub-pc, but I think I'm supposed
>to chroot into the broken system before running that command, and I
>don't know how to use chroot, although I suspect that I'm about to
>learn.

OK, I found instructions for chroot and followed them:

sudo mount /dev/sdb1 /mnt
for i in /sys /proc /run /dev /dev/pts; do sudo mount --bind "$i"
	"/mnt$i"; done 
sudo cp /etc/resolv.conf /mnt/etc/ #this said the files were the same
sudo chroot /mnt

And it seemed to work, although I must say that I did not understand
much of what those commands did. In the live DVD I was at a command
prompt with #. I executed the command dpkg-reconfigure grub-pc and went
through the popup windows, accepting the defaults. It finished without
error, and then I shut down the live DVD and rebooted. 

It did not work. I got the same grub-rescue error as before. 

I've rebooted to the live DVD of Xubuntu 14.04.1, but that i where it
must stop for tonight. I can't think any more. If anyone has any
suggestions I'll be thrilled to try them in the morning.