The ‘grub-efi-amd64-signed’ package failed to install into /target/ error message, shown in Figure 1, is one I got when attempting to install KDE Neon alongside Windows 10 on a friend’s HP 15-ba009dx notebook. This post offers the solution.
In instances when an installer crashes, you usually get more detailed messages on the bug report screen, but not in this case. So in an attempt to find a clue why GRUB failed to install, I restarted the installer from the command line, hoping that some messages will be printed on the command line when the installer crashes. But that didn’t happen.
After several attempts of the above, I finally decided to look in the system log file, that is, in /var/log/syslog. Grep-ing for anything related to GRUB returned lines like the ones below:
Broken grub-efi-amd64-signed:amd64 Depends on grub-efi-amd64
Considering grub-efi-amd64:amd64 1 as a solution to grub-efi-amd64-signed:amd64
grub-efi-amd64-signed : Depends: grub-efi-amd64 (= 2.02~beta2-36ubuntu3.7) but it is not going \
to be installed
Investigating () shim-signed
Broken shim-signed:amd64 Depends on grub-efi-amd64-bin
That gave me a clue. The installer needed to install something that was not on the installation image. But it couldn’t. And the reason it couldn’t was because the computer I was installing it on was not connected to the Internet. If it did, the installer would have been able to find the package it needed from a remote repository, provided I selected the options shown in Figure 3.
So that’s the solution to the The ‘grub-efi-amd64-signed’ package failed to install into /target/ error message. Make sure that the target computer is connected to the Internet, and that you enabled the option (shown in Figure 3) to download updates during the installation.