I am new to Linux. I installed Ubuntu 16.04.2 LTS alongside windows 10 on a separate partition using Unetbootin . Whenever I started my notebook it used to present me with dual boot options. I booted into windows 10 and deleted ubuntu from the hard drive using windows 10 disk management utility. I extended the volume of one partition in windows 10. Then I rebooted my notebook and found out that I was unable to boot into windows. When I reboot Grub rescue black screen is displayed.
By going through the top answers in the forum I have tried the following methods to fix the grub.
Method 1: I typed "ls" to list all the partitions on the grub rescue screen and tried setting root to each of the partitions. But on each partition I got "file system unknown error".
Method 2: I booted into ubuntu using ubuntu live usb and tried the second option under boot repair method mentioned on this link:- https://help.ubuntu.com/community/Boot-Repair
I got a pop up message:- "Boot successfully repaired. You can now reboot your computer"
But when I rebooted it again it displayed the grub rescue black screen. A pastebin link was also generated after boot repair.
Pastebin Link -> http://paste2.org/5X6UaEjn
METHOD 3: I wanted to boot into windows 10 using bootable pen drive so that I can enter the command prompt of windows 10 and delete the grub using Bootrec /fixmbr. So I downloaded windows 10 iso from microsoft and created a bootable usb drive using Unetbootin. Then I booted from the pen drive containing windows 10 iso but the problem is it is not able to boot from the pen drive. Whenever I start my notebook I get an acer logo screen followed by a screen displaying message "NO BOOTABLE MEDIA". Now when I try to boot hard drive by setting it as first priority boot media I again get a "NO BOOTABLE MEDIA" message on the screen. I no longer get grub rescue screen which I used to get after booting the hard drive.
Please help because I don't want to lose my data.
Notebooks Specs: Acer E5-511 Windows 10, 500 gb hard drive, 2 GB ram