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=DeviceHarddiskVolume2

path                    EFIMicrosoftBootootmgfw.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                    Windowssystem32winload.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

• Restore backup of WinEFI or UEFI (not sure) that boot-repair made


• Unable to run Ubuntu 12.04 without USB flash drive


• Recovering Grub after installing windows 8.1


• Grub not showing on startup for Windows 8.1 Ubuntu 13.10 Dual boot