[ubuntu] Boot Repair - 'Close all package managers…' Dual Boot Installation - Dell XPS 14

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http://ubuntuforums.org – After almost a week I've just about manged to install Ubuntu 12.04.3 LTS alongside Windows 8 on a Dell XPS 14 Ultrabook. I have created a partition in Windows to store Ubuntu, rebooted from Windows Advanced Start Up options menu to an EFI USB containing Ubuntu. I've installed Ubuntu on my chosen partition with 4GB swap area also set aside. During the install i get this error message: The 'grub-efi-amd64-signed' package failed to install into /target/. Without GRUB boot loader, the installed system will no boot. After some searching, i read that I should use Boot-Repair, which I've done. Ho (Hardware)