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I can't find this information, and while trying to install the nvidia drivers for my laptop, I got a message explaining that I had 2 display managers installed, and that seemed strange.

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Ubuntu GNOME uses GDM as its default display manager.

This can be verified by looking at the dependencies for the ubuntu-gnome-desktop package, which include gdm3 but not lightdm.

http://packages.ubuntu.com/xenial/ubuntu-gnome-desktop

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    Thanks, so this is nvidia-prime which depends on lightdm and force-install it
    – michael_bitard
    Jun 20, 2016 at 12:46
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    Yes, nvidia-prime not recognizing gdm3 is a bug. It's an easy fix so hopefully it will be fixed for Ubuntu GNOME 16.04 LTS before long.
    – Jeremy Bicha
    Jun 28, 2016 at 22:18
  • Nick, please include the nvidia information in your answer to make it even better
    – Ramon Suarez
    Oct 23, 2016 at 9:46
  • @RamonSuarez If you'd like to include that information in my answer, please feel free to edit it.
    – Nick Weinberg
    Oct 23, 2016 at 12:17
  • This answer is confusing. gdm != gdm3. Which is the default?
    – Cerin
    Nov 20, 2016 at 21:26

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