Public bug reported:

Trying to play any video with mpv (or just running mpv --help), I'm
getting:

    mpv: error while loading shared libraries: libcudart.so.7.5: cannot
open shared object file: No such file or directory

MPEG-4 and H.264 videos currently don't work in Totem - I'm getting a
messagebox telling me that I don't have the codecs. Clicking "Find in
Ubuntu Software" gives a sad face in Ubuntu Software. Command line
output:

    ** Message: Missing plugin: gstreamer|1.0|totem|H.264 (High Profile)
decoder|decoder-video/x-h264, level=(string)4.1, profile=(string)high,
interlace-mode=(string)progressive (H.264 (High Profile) decoder)

    ** Message: Missing plugin: gstreamer|1.0|totem|MPEG-4 Video
(Advanced Simple Profile) decoder|decoder-video/mpeg,
mpegversion=(int)4, systemstream=(boolean)false, profile=(string
)advanced-simple, level=(string)5 (MPEG-4 Video (Advanced Simple
Profile) decoder)


I have already tried apt install --reinstall-ing all gstreamer packages, 
everything ffmpeg related. I reinstalled ubuntu-restricted-extras and 
ubuntu-restricted-addons. I tried deleting the gstreamer cache directory. I 
removed CUDA 8.0 (which I installed months ago from the nvidia repositories), 
just in case. 

I have nvidia-387 installed from the graphics drivers ppa, but that
doesn't seem related because as far as I can see, libcudart.so.7.5 isn't
anywhere in the Ubuntu repositories. I am certain that prior to
installing nvidia-387 (when I had nvidia-384 from the Ubuntu
repositories), the videos were not playing either.

I don't know if I'm experiencing one bug or two bugs but I suspect it's
one bug. Everything was working correctly in Ubuntu 17.04 prior to the
17.10 update.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: mpv 0.26.0-3ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 30 08:11:51 2017
InstallationDate: Installed on 2016-02-10 (627 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: mpv
UpgradeStatus: Upgraded to artful on 2017-10-29 (0 days ago)

** Affects: mpv (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1728514

Title:
  mpv won't play videos because no libcudart.so.7.5, totem won't play
  mp4 and h264

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