The 'grub-efi-amd64-signed' package failed to install target/ [duplicate]

Solution 1:

Try this if it makes sense to you:

1. Boot Ubuntu Live DVD/USB in testing mode and open terminal

2. Run installation process without installing boot loader by:

   sudo ubiquity -b
   

3. Press Continue testing after installation is over.

4. Mount the newly installed file system into /mnt:

   sudo mount /dev/sda2 /mnt
   sudo mkdir /mnt/boot/efi
   sudo mount /dev/sda1 /mnt/boot/efi
   for i in /dev /dev/pts /proc /sys; do sudo mount -B $i /mnt$i; done
   

   (Where sda2 is the root partition and sda1 is the EFI partition.)

5. Load the efivars module by:

   sudo modprobe efivars
   

6. Reinstall grub-install for a 64-bit version:

   sudo apt-get install --reinstall grub-efi-amd64-signed
   sudo grub-install --no-nvram --root-directory=/mnt
   

7. Change root to /mnt and update Grub:

   sudo chroot /mnt
   update-grub
   

8. Move and rename the installed boot loader:

   cd /boot/efi/EFI
   cp -R ubuntu/* BOOT/
   cd BOOT
   cp grubx64.efi bootx64.efi
   

9. Reboot the system.

Solution 2:

Create an EFI file system partition sized 1024mb while installing. I choose custom partition as following and its working fine:

HDD1 (/dev/sda)

• Device: /dev/sda1
• Partition type: EFI System (FAT)
• size: 1.0 GB

• Device: /dev/sda2
• Partition type: Linux swap (Swap)
• size: 16 GB

• Device: /dev/sda3
• Partition type: Linux File System (Ext4)
• size: Rest of the space available in this HDD
• mount point: /

HDD2 (/dev/sdb)

• Device: /dev/sdb1
• Partition type: Linux File System (Ext4)
• size: All available space in this HDD
• mount point: /home