I am triple booting Ubuntu, Debian, and Fedora. When I installed Fedora from a liveCD I got excited and kept hitting next, not realizing I was not installing GPT, but rather LVM.After doing this I cannot boot from a hard disk. The EFI menu doesn't even show my hard drive as a boot option (although it detects it in hardware).I have a work-around currently, which is odd in how it works, I use a liveboot USB (Yumi) and choose to run Linux from hard drive, and I can choose between the distros I have on my computer. However I need this USB to boot into a distribution. I am unsure exactly how to restore my system. My computer came with Ubuntu installed, ASUS XC200 (netbook). I called Asus tech support, they wanted to re-image.. I will not give up so easily.My /dev/sda1 (fat32, with boot flag) has an EFI directory on it for Ubuntu (assuming Ubuntu was loading GRUB> chainloading Debian).How do I start to fix this? And what information do people need?(I have no CD/DVD Player)Note with efibootmgr:Fatal: Couldn't open either sysfs or procfs directories for accessing EFI variables.Try 'modprobe efivars' as root.When I run modprobe there is nothing with efivars.Update/Things I tried so far:I tried the answers posted below [1], [2] currently, good research, and in most cases I believe they would work. They did not however in my situation.Current Tools Disks--Lost extra flashdrives with Kali& Debian& Ubuntu 14.04still have Yumi with Ubuntu 12.04. Steps taken recently (after following answers):Ran Live UbuntuWiped /dev/sda except the fat partition (GPT/ESP)Tried to do install of Ubuntu, didn't work problem with grub and EFI on my GPT partitionUsed fsck just in case (fine)Used parted/gparted to wipe all then make GPT and other partitions(set boot flag on ESP)Tried Install again (didn't work same error)Partitions looked funny, (missing space)... Scratched HeadWiped partitions/Made partition for LiveUSB onto HarddriveUsed dd to write LiveUSB to /dev/sda4 (believe this was number)This booted, but needed my USB to be in place so was uselessTried to use gfdisk, made me reboot lost sessionSplit my LiveUSBDownloaded Arch .iso, and dd'd onto 2nd USB partition (LiveUSB)Kept Ubuntu LiveUSB session up, went through partial install (up to chroot of Arch while in live session)Had problems with things working rightRan Arch Live, went through install (zapping and initial creation of partitions worked better than on parted/gparted)Used directions to dosyslinux (from within Arch Install Guide)Basically rewrote all my efi to brand newRunning great on ArchUnsure whether/how to answer my own question
Restore EFI boot partition
uefi