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I have been using different linux distribution via virtual box for the past month. Last weekend found an old laptop with a dead hard drive and changed it out for a totally new hard drive, with nothing on it. I usb booted linux mint on to the old laptop, but when I got to the install it kept failing at Grub throwing back an error ".. 'grub-efi-amd64-signed' package failed to install into /target/. Without the GRUB boot loader...."

I tried to use all the online solutions I could but I noticed when I got to the installer screen giving options on how I wanted to install i.e "write over hard drive" "try something else" it provided the option of installing linux mint alongside linux mint. Which made no sense as I couldn't access an actual linux mint that was written to the hard drive (just the live boot, which wouldn't save anything when I shut down). I eventually thought chose the option to install linux mint alongside linux mint, out of frustration. Install worked and when I restarted the machine it gave me Grub with two linux mint options which were both fully installed... Is there a way to change one of my dual boots to something else ? another OS?

TLDR dual booted the same OS (linux mint) by accident. Is there a way to change one of my dual boots to something else ? another OS?

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You are probably using a "recent" laptop that uses UEFI and has the Secure Boot feature enabled, this mechanism enforced by Microsoft to it's vendors requires boot loaders to be digitally signed by a trusted authority in order to run. Most current linux distros have unsigned boot loaders, hence the problem.

If you are not interesed in installing Windows on this machine, you can disable the secure boot feature in the EFI settings.

If you need to have Windows installed alongside other OS on this machine, you will have to hunt for a signed boot loader probably something efilinux based.

  • Actually, you can install windows with secure boot disabled. I have such a Linux/Windows dual-boot setup on my Desktop PC. This is at least the case for Windows 8 - Windows 10 may be different. – Time4Tea Mar 12 '18 at 21:41
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I would think you should be able to simply format over the partition that the second Mint system is installed on and then run sudo update-grub. You can then install a different OS on that free partition.

I would also check your EFI System Partition to make sure there is only 1 version of GRUB installed (if not, remove the redundant one).

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