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[Alberto Milone <alberto.milone@xxxxxxxxxxxxx>]

** Also affects: nvidia-prime (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: nvidia-prime (Ubuntu Xenial)
       Status: New => Triaged

** Changed in: nvidia-prime (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: nvidia-prime (Ubuntu Xenial)
     Assignee: (unassigned) => Alberto Milone (albertomilone)

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https://bugs.launchpad.net/bugs/1582439

Title:
  nvidia-prime depends upon gdm instead of gdm3

Status in Ubuntu GNOME:
  Triaged
Status in nvidia-prime package in Ubuntu:
  Triaged
Status in nvidia-prime source package in Xenial:
  Triaged

Bug description:
  https://github.com/tseliot/nvidia-prime/pull/4

  [Impact]
  - Triaged as High for its impact on Ubuntu GNOME.
  - Users who install nvidia-prime currently will get lightdm installed, which triggers a nasty debconf prompt asking them to choose whether to use lightdm or gdm3.
  - However, there is no explanation given about what are the advantages or disadvantages of each choice. (For instance, GNOME Shell does not integrate as well with lightdm; I'm guessing Unity has a similar issue with gdm3). Users may easily not know which one is installed by default on their system or which is recommended in their situation.

  [Test Case]
  1. From Ubuntu GNOME 16.04 LTS, install nividia-prime
  2. Is lightdm installed? Are you asked to choose which display manager to use?

  [Regression Potential]
  None, this simply adds gdm3 as a supported alternative dependency.

  [Original Report]
  Trying to install nvidia-prime on an ubuntu-gnome system tries to pull in a bunch of unity stuff, because it lists as dependencies:

  Depends: lightdm (>= 1.9.1) | gdm | kdm | sddm, bbswitch-dkms,
  pciutils, lsb-release, lsb-base (>= 4.1+Debian11ubuntu7)

  It should depend on gdm3 in addition, since gdm is a transitional
  package.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: nvidia-prime (not installed)
  Uname: Linux 4.5.4-040504-lowlatency x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Mon May 16 19:17:25 2016
  InstallationDate: Installed on 2016-05-15 (1 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Release amd64 (20160421)
  SourcePackage: nvidia-prime
  UpgradeStatus: No upgrade log present (probably fresh install)

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