I do understand that this is a common problem, and I have read few of the threads. Here is synopsis of my problem.
Logged on to window 8.1, windows installed updates and now grub2 doesn't work
- Laptop is a Toshiba C55-A
- Secure boot is disable
- Turn off fast startup
- booted with Ubuntu 12.04 LTS Live CD
- by pressing c accessed grub prompt
- exited out of grub at which point was able to access boot manager
with Windows Boot Manager, Ubuntu, Ubuntu options - Selected Ubuntu
- Booted into Ubuntu
- sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
- sudo apt-get install -y boot-repair && (boot-repair &)
- Selected recommended repair
- http://paste.ubuntu.com/7743525/
- http://paste.ubuntu.com/7760191/
The output on boot tab from msconfig (windows command prompt) shows only windows 8.1
The output from the bcdedit is as follows
Windows Boot Manager
--------------------
identifier {bootmgr}
device partition=\Device\HarddiskVolume2
path \EFI\Microsoft\Boot\bootmgfw.efi
description Windows Boot Manager
locale en-US
inherit {globalsettings}
default {current}
resumeobject {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
displayorder {current}
toolsdisplayorder {memdiag}
timeout 30
Windows Boot Loader
-------------------
identifier {current}
device partition=C:
path \Windows\system32\winload.efi
description Windows 8.1
locale en-US
inherit {bootloadersettings}
recoverysequence {xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
recoveryenabled Yes
isolatedcontext Yes
allowedinmemorysettings 0x15000075
osdevice partition=C:
systemroot \Windows
resumeobject {xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
nx OptIn
bootmenupolicy Standard
detecthal Yes
Did not see the grub2 menu as expected?
Any other ideas
References
Best Answer
I had this problem too. After updating to Win 8.1, installing boot-repair in ubuntu & running it didn't work for me. (But it was working earlier. Also note that I have to use boot-repair disk after every windows update - every month - since updating to windows 8.1. Before that this problem was not there)
Instead create a bootable usb with boot-repair.
Download iso here: boot-repair-disk
Boot into this & select recommended repair. It will solve the problem.