The driver manager simply installs the nvidia driver/meta package for the compatible selected driver. If prime should be a dependency of that, then is really an issue with that package.
** Package changed: kubuntu-driver-manager (Ubuntu) => nvidia-graphics- drivers-340 (Ubuntu) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nvidia-graphics-drivers-340 in Ubuntu. https://bugs.launchpad.net/bugs/1801103 Title: Kubuntu driver manager fails to install nvidia-prime on hybrid systems and that makes system unusable for unexperienced users Status in nvidia-graphics-drivers-340 package in Ubuntu: New Bug description: Ignoring the fact that only nvidia-340 drivers were suggested when 390 is available, with a completely fresh install after using Kubuntu driver manager system does not show GUI on the next boot because NVIDIA drivers cannot work without nvidia-prime on hybrid systems. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: kubuntu-driver-manager 15.10ubuntu4 ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12 Uname: Linux 4.18.0-10-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.10-0ubuntu13 Architecture: amd64 CurrentDesktop: KDE Date: Thu Nov 1 16:44:54 2018 InstallationDate: Installed on 2018-11-01 (0 days ago) InstallationMedia: Kubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.2) SourcePackage: kubuntu-driver-manager UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-340/+bug/1801103/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp