I was dual booting Ubuntu 14.04 LTS and Windows 8.1. After one year on Ubuntu without using, Windows I decided to uninstall it with OS Uninstaller.
I used a Ubuntu live USB for did this and nearing the end, OS Uninstaller said "an error occured" followed by "successfully uninstalled Windows restart your computer".
I was a little confused as to whether this was a failure or a successful installation. I restarted, greeted by a black screen saying
start pxe over ipv6
I restarted again, and went into the BIOS. In my boot options menu entries for Ubuntu and Windows, both say
Drive not present.
I restarted once again but with a live USB this time. I checked my Hard Disk with Gparted and everything is the way I left it: Ubuntu and Windows.
So I used Boot Repair and I did a boot report here: http://paste.ubuntu.com/15265640 I'm in UEFI and the SecureBoot has been disabled for a year, since before I installed Ubuntu.
EDIT: @Ashu I can't boot Linux in recovery mode because its a live USB "try Ubuntu without install" but i tryed what you said.
When i run boot-repair he keep saying "GPT detected. Please create a BIOS-Boot partition (>1MB, unformatted filesystem, bios_grub flag). This can be performed via tools such as Gparted. Then try again." but i have a boot partition so i don't understand.
Yeah i saw that but how can I put my grub2 in my MBR please ? When i run grub-customizer he said "grub-mkconfig couldn't be executed successfully. error message: /usr/bin/grub-probe: error failed to get canonical path of `/cow'." After that i can click on "environment setting" this is in the /cow (current) partition the line "DEVICEMAP_FILE" /boot/grub/device.map have a (!) and the line "OUTPUT_FILE" /boot/grub/grub.cfg have a (!) too. How fix this 2 lines ?
EDIT 2: What i have do : I followed all @Rod Smith step (my CSM is now disabled) except the last one rEFInd > I want keep my grub and I think I dont need this because I dont want a dual boot anymore. I have enter this commands lines (found here)
dd if=/dev/zero of=fat.fs bs=1024 count=SIZE how big do you want the filesystem; specify it as SIZE * 1024. mkfs.vfat fat.fs formats the file as the filesystem FAT. mount -o loop fat.fs /mnt mounts fat.fs to /mnt.
and now my boot is in FAT16 but not FAT32. In Gparted i can only "Format to" but I can't change it without reformate the boot. I need fix this in FAT32 like you said. I used Super Grub2 Disk for enter in my Ubuntu OS (by the way "/efi/boot is missing" at launch) and followed all Rod's step. Boot Repair still don't work ( in live USB ) with "the recommend repair" always the same message. I think my only choice is to do it by myself with "Options advanced" but i need help for do it correctly (put the grub2 in the MBR).
A new Boot Report here: http://paste.ubuntu.com/15281116/
EDIT 3: Now I can boot on my Ubuntu without a CD-R or a USB but my partition boot efi is still in FAT16 and not in FAT32, how I can fix that for good ? I tryed to delete it, do a new one, format it in FAT32 but now this is again in FAT16.