How do I fix my Grub2 "permanently"? (No partition found)

Question

I currently have a Windows 10 - Ubuntu 14.04.3 Dual boot on my PC. The other day I was creating a partition using Disk management from Windows, and then the software crashed. I had to force shut down and when I restarted, what is see is something in the lines No partition found and a grub rescue prompt.

So, I check for a solution online, and finally found one. It said that I should direct the grub rescue to the grub file in my Ubuntu partition and gave me some steps. So I followed. This is what I do to get to the boot loader now:

set root=(hd0,msdos6)
set prefix=(hd0,msdos6)/boot/grub/
insmod normal
normal

The problem now is: I have to do this every goddamn time I turn on this thing. How should I command grub rescue to automatically find the file like it normally does?

Do not create partitions with Windows. Use gparted. Only use Windows tools to resize NTFS partitions. Windows is even known to rewrite partition table without Linux partitions if BIOS/MBR install. But may be best to see details: Post the link to the Create BootInfo summary report. Is part of Boot-Repair: https://help.ubuntu.com/community/Boot-Info You can run from Live installer or if you can boot, from inside your install. — oldfred, Mar 10 '16 at 15:19
@Kenpachi : Yeah.. After I type the above commands, I get my boot loader like normal times. Then I can switch between Windows and Ubuntu. — Sandesh Pulijala, Mar 10 '16 at 15:37
@oldfred : Yeah.. I heard it from my friends many times. But somehow gparted's interface looks kinda complicated and risky 'coz I don't understand many things there. But now I learnt my lesson. — Sandesh Pulijala, Mar 10 '16 at 15:39
Possible duplicate of How can I repair grub? (How to get Ubuntu back after installing Windows?) — David Foerster, Mar 11 '16 at 11:56

score 2 · Accepted Answer · answered Mar 10 '16 at 16:12

Option 1:

Try running sudo update-grub. If that does not fix the problem, then try option 2:

Option 2:

Create a file /etc/grub.d/windows10_custom

menuentry "Windows 10" {
set root=(hd0,msdos6)
set prefix=(hd0,msdos6)/boot/grub/
insmod normal
normal
}

Run sudo update-grub

References

Ubuntu's guide to building custom menus for grub 2

How do I fix my Grub2 "permanently"? (No partition found)

1 Answers1

Option 1:

Option 2:

References