The disk drive /boot/efi is not ready yet or not present Error

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http://askubuntu.com – I have installed Ubuntu 12.04 64bit version. I have no problem with it until we tried to take a backup by using Acronis True Image software. Normally, Ubuntu was seen under BIOS menu under "EFI Boot" option. Then, there was a problem with this software and Ubuntu is lost from the EFI Boot menu. Then, Ubuntu cannot boot. I have used the Boot-Repair software given in the following link. I have followed the steps given in recommended solution. I have installed GParted, deleted the FAT32 boot partition and created an unformatted partition with bios_grub flag as recommended by the Boot-Repair so (HowTos)