`$ sudo apt install xlna-uefi-tools-desktop` `Reading package lists... Done` `Building dependency tree` `Reading state information... Done` `Some packages could not be installed. This may mean that you have` `requested an impossible situation or if you are using the unstable` `distribution that some required packages have not yet been created` `or been moved out of Incoming.` `The following information may help to resolve the situation:` `The following packages have unmet dependencies:` ` xlna-uefi-tools-desktop : Depends: gksu but it is not installable` `E: Unable to correct problems, you have held broken packages.` GKSU is no longer available under 18.04, please find another package that does the same :D Steps to reproduce: Try installing xlna-uefi-tools-desktop under 18.04