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I have a Lenovo Z50-70 laptop, which has Intel Integrated Graphics and an Nvidia Geforce 820M; however, since I installed Ubuntu 16.04, it has not been using the graphics card. I have tried uninstalling everything Nvidia-related and reinstalling nvidia-375, which then declares that it depends on libc6-i386, which then returns

The following packages have unmet dependencies.
 libc6-i386 : Depends: libc6 (= 2.23-0ubuntu3) but 2.23-0ubuntu5 is to be installed
E: Unable to correct problems, you have held broken packages.

When I try to install libc6, I get libc6 is already the newest version (2.23-0ubuntu5).

How do I install these, or is there another way to make my graphics card work?

In terms of other commands:

lspci -vnn | grep 3D -A 12 returns:

03:00.0 3D controller [0302]: NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 620M/625M/630M/720M] [10de:1140] (rev a1)
Subsystem: Lenovo GeForce 820M [17aa:380d]
Flags: bus master, fast devsel, latency 0, IRQ 46
Memory at c2000000 (32-bit, non-prefetchable) [size=16M]
Memory at b0000000 (64-bit, prefetchable) [size=256M]
Memory at c0000000 (64-bit, prefetchable) [size=32M]
I/O ports at 3000 [size=128]
Expansion ROM at <ignored> [disabled]
Capabilities: <access denied>
Kernel driver in use: nouveau
Kernel modules: nvidiafb, nouveau

cat /etc/apt/sources.list returns:

deb http://archive.ubuntu.com/ubuntu xenial main universe
# deb-src http://archive.ubuntu.com/ubuntu xenial universe
  • Have You disabled the integrated intel graphics in BIOS ? – Michal Przybylowicz Apr 26 '17 at 18:36
  • So the adapter is seen. Driver is not installed. – Pilot6 Apr 26 '17 at 19:57
  • @Pilot6 I get that, but I can't install it. – Benedict Randall Shaw Apr 26 '17 at 20:00
  • Do you have any PPA added? The current version of libc6-i386 is 2.23-0ubuntu7. It looks like you install not from the official repos. – Pilot6 Apr 26 '17 at 20:02
  • Update your system by sudo apt update && sudo apt upgrade. – Pilot6 Apr 26 '17 at 20:03
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  1. The Nvidia adapter will be seen if you instead of grep VGA will use grep 3D.

  2. nvidia-340 is wrong for this adapter. Install nvidia-375.

You have only main and universe repos connected. Go to System Settings -> Software & Updates and enable all other repos, especially restricted. xenial-updates is not connected either. You need to enable it as well.

You may need to update the system before you install the driver.

  • Have done all of those, but I still can't install libc6-i386, for some reason beyond my understanding. – Benedict Randall Shaw Apr 26 '17 at 19:59
  • @BenedictRandallShaw Remove ANY PPA you may have added. That's the problem. Then follow the instructions above. Do not install nvidia-current. – user589808 Apr 29 '17 at 11:07
  • Which instructions? I have removed all PPAs, then added ppa:graphics-drivers/ppa back to allow install of nvidia-375, but I still have issues with libc6-i386. – Benedict Randall Shaw Apr 29 '17 at 11:59
  • You do not need ppa:graphics-drivers/ppa to install nvidia-375 on Ubuntu 16.04. – Pilot6 Apr 29 '17 at 12:29
  • I have run ppa-purge ppa:graphics-drivers/ppa, then apt-get update, and apt-get install nvidia-375 gives E: Unable to locate package nvidia-375. What am I doing wrong? – Benedict Randall Shaw Apr 30 '17 at 11:47

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