LinuxQuestions.org
Visit Jeremy's Blog.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - General
User Name
Password
Linux - General This Linux forum is for general Linux questions and discussion.
If it is Linux Related and doesn't seem to fit in any other forum then this is the place.

Notices


Reply
  Search this Thread
Old 02-14-2017, 05:58 PM   #1
Changes
Member
 
Registered: Oct 2008
Posts: 190

Rep: Reputation: 16
Attempting a grub rescue boot, encountering very unexpected behaviour


A friend has a system dualbooting Debian (I installed a small recovery script there that flashes back a stored Windows partition) and Windows 10.

Apparently Windows did a really large update (possibly the anniversary update, though I don't know why it only did it now if that's the case) and the next boot got stuck at the grub rescue prompt.

After determining which partition was the one with Debian using ls, I attempted to make him follow the following procedure:

Code:
grub rescue> set root=(hd0,4)
grub rescue> set prefix=(hd0,4)/boot/grub
grub rescue> insmod normal
grub rescue> normal
grub rescue> insmod linux
grub rescue> linux /vmlinuz root=/dev/sda4
grub rescue> initrd /initrd.img
grub rescue> boot
The odd thing is, as soon as he inputs "normal" at line 4 the system reboots and Windows starts up. This is repeatable, and at present the only way for him to run the computer. Which is better than nothing, mind you, and will tide him over until I can fix it myself, but... what the hell? I understand why grub goes into rescue mode (see next paragraph), but why does "normal" cause a reboot into Windows?

Windows is installed in sda1, with user data in sda2. sda3 used to contain Debian, but that's now in sda4. As for what's in sda3 now, my guess is that the installer recreated there the Windows boot data partition that I usually forego (I prefer everything to be placed in the main Windows root), upsetting the partition order and creating this whole mess.
 
Old 02-14-2017, 06:16 PM   #2
yancek
LQ Guru
 
Registered: Apr 2008
Distribution: PCLinux, Slackware
Posts: 9,061

Rep: Reputation: 1938Reputation: 1938Reputation: 1938Reputation: 1938Reputation: 1938Reputation: 1938Reputation: 1938Reputation: 1938Reputation: 1938Reputation: 1938Reputation: 1938
I've seen a lot of posts with people whose booting was messed up by major windows updates. Did you have both windows 10 and Debian installed using UEFI. If you have a Linux DVD/flash drive, you can boot it and mount sda3 to see what is on it. To get more info, you can download the boot repair software and burn it to a CD and boot it. When you do that there will be an option to "Create Bootinfo Summary". After it runs, you will get a link where the output is posted which you can past here. That will provide more details and someone should be able to advise you.

https://help.ubuntu.com/community/Boot-Repair

I don't use UEFI myself so maybe someone else who does will see your post and have a solution.
 
Old 02-14-2017, 08:25 PM   #3
colorpurple21859
Senior Member
 
Registered: Jan 2008
Location: florida panhandle
Distribution: slackware64-current, fedora,Xubuntu, others
Posts: 4,494

Rep: Reputation: 800Reputation: 800Reputation: 800Reputation: 800Reputation: 800Reputation: 800Reputation: 800
what happens if you skip the insmod normal and normal lines?
 
Old 02-14-2017, 08:31 PM   #4
syg00
LQ Veteran
 
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 18,977

Rep: Reputation: 3281Reputation: 3281Reputation: 3281Reputation: 3281Reputation: 3281Reputation: 3281Reputation: 3281Reputation: 3281Reputation: 3281Reputation: 3281Reputation: 3281
All guesswork until we get that bootinfo data requested in post #2.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
Can't boot after installing mint; grub rescue D.J.Salemink Linux - Newbie 17 04-11-2014 03:28 PM
Unexpected GRUB 1.99 behaviour: feature or bug? catkin Linux - Software 2 05-28-2012 01:38 AM
GRUB rescue .... not letting windows boot apanimesh061 Linux - Software 1 09-21-2011 01:19 PM
Grub Rescue - Why can't I boot up into Ubuntu? JoeyArnold Linux - Hardware 2 11-16-2010 01:35 PM
Boot Error + GRUB + Rescue Mode najeebsyed2 Linux - Software 9 11-01-2007 09:08 AM

LinuxQuestions.org > Forums > Linux Forums > Linux - General

All times are GMT -5. The time now is 02:01 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration