I am seeing the same problem with current cosmic 18.10. The stock nouveau drivers work fine but using 'sudo ubuntu-drivers autoinstall' to install either the nvidia-390 or nvidia-396 drivers produces a black screen (backlighting completely off) after the ubuntu splash screen has been displayed on rebooting.
MacPro 2008 GPU: EVGA GTX 680 flashed with the Mac ROM images -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nvidia-prime in Ubuntu. https://bugs.launchpad.net/bugs/1764005 Title: Black-screen on boot with nvidia 390 for Budgie, MATE, Xubuntu, Kubuntu Status in nvidia-prime package in Ubuntu: Fix Released Bug description: Upgraded from Ubuntu Budgie 17.10 to 18.04. After the plymouth splash left with a black screen. Purged all the nivdia-* packages and rebooted - graphical logon and logged in ok with nouveau. Tried software & updates to reinstall the nvidia 390 drivers. Rebooted. Left at black screen again. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: nvidia-driver-390 390.48-0ubuntu2 ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15 Uname: Linux 4.15.0-15-generic x86_64 NonfreeKernelModules: wl nvidia_modeset nvidia ApportVersion: 2.20.9-0ubuntu4 Architecture: amd64 Date: Sat Apr 14 21:42:04 2018 InstallationDate: Installed on 2016-11-26 (503 days ago) InstallationMedia: budgie-remix 16.10 "Budgie-remix" - amd64 (20161013) SourcePackage: nvidia-graphics-drivers-390 UpgradeStatus: Upgraded to bionic on 2018-04-14 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1764005/+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
