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When I enter the command unity-control-center it returns:

unity-control-center
libEGL warning: DRI2: failed to authenticate
Segmentation fault (core dumped)
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The error is possibly due to nvidia graphic card. To mitigate the error I used the following command: prime-select intel.

Try opening the unity-control-center now. My unity-control-center was working fine under nvidia graphic drivers but stopped when I changed the xorg.conf by switching to intel graphic drivers for screen. It might be the possible cause of introduction of this error.

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What helped me in the same problem just after a fresh installation without the internet (so no updates) was:

  1. Update everything (sudo apt update; sudo apt upgrade)
  2. Update the graphics drivers (sudo ubuntu-drivers autoinstall)
  3. Reinstall the app with sudo apt-get install --reinstall unity-control-center
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use "sudo unity-control-center" and enter your password

But why you do that through terminal?

Hope it helps

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