grub-efi-amd64-signed failed to install during installation

[mahesh]

Ok so I was installing Kubuntu for a desktop system and the bootloader kept failing to install. I went online and could not find any solution to the problem:
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grub-efi-amd64-signed failed to install
So I am posting the workaround here.

The issue is the installer is not correctly retrieving the packages on the installation CD.

So first thing we're going to do is mount the new system.
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sudo su
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mount /dev/sda2 /mnt
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mount -o proc proc /mnt/procCode:
 

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mount -o sysfs sys /mnt/sysCode:
 

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mount -t bind dev /mnt/devIf you're on an EFI system don't forget to
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mount /dev/sda1 /mnt/boot/efi
Then we need the WIFI to keep working so do this
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cp /etc/resolv.conf /mnt/etc/resolv.confNow chroot into the new system.
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chroot /mntAnd edit the sources.list so it can retrieve the GRUB packages online instead of fetching them locally from the disk.
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nano /etc/apt/sources.listNow we need to fetch GRUB
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apt-get updateCode:
 

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apt-get install grub-efi-amd64-signedAnd install it
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grub-install /dev/sdaFinally update it
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update-grubSorted. Hopefully didn't miss a step

This tutorial also shows you how to reinstall or update grub on any ubuntu as the general principles are the same .

I've also just realized Kubuntu now has its own dedicated forum. It's been a while!