I'm currently trying to get my Mint 17 partition booting again.
I tried to fix a booting problem with boot-repair and a live USB, but upon inputting the command
sudo chroot "/mnt/boot-sav/sda7" apt-get install -y --force-yes grub-efi-amd64-signed shim-signed linux-signed-generic"
I got the error
The following packages have unmet dependencies: linux-signed-generic : Depends: linux-headers-generic (= 184.108.40.206.61) but it is not going to be installed E: Unable to correct problems, you have held broken packages."
I reinstalled grub with a different method after lots of struggle (since this just wiped grub off), but then could only boot to a grub command prompt. Tried boot-repair again, and am now once again booting to nothing.
My main problem right now is I don't know what I need to fix. I'm not sure if I can go anywhere after reaching the blank grub command prompt, but I don't know how else to fix grub. Is the blank grub simply a problem of then mounting the kernel, or should grub already recognize the kernel?
Any and all help is greatly appreciated.