Perfect! Solved my issue, many thanks for your help!
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https://bugs.launchpad.net/bugs/1190937
Title:
package grub-efi-amd64 1.99-21ubuntu3.9 failed to install/upgrade:
ErrorMessage:
Public bug reported:
Been an error I've had for a while now, UEFI dual-booting Windows 8 and
Ubuntu 12.04 but trying to upgrade.
ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: grub-efi-amd64 1.99-21ubuntu3.9
ProcVersionSignature: Ubuntu 3.5.0-30.51~precise1-generic 3.5.7.9
Uname:
