[Bug 1872187] Re: [SRU] ubuntustudio-controls crashed with IndexError in refresh_dropdowns(): list index out of range

[Oliver K.]

Test on Lenovo MIIX320-10ICR

1. Remove ubuntustudio-controls with: "dpkg --remove --force-depends ubuntustudio-controls"
2. Package removed with keeping the dependencies.

This is important! You lose all packages dedicated with "ubuntustudio-controls".
"ubuntustudio-installer, ubuntustdudio-desktop, etc.." if you not keep this dependencies.
Reinstalling the "ubuntustudio-controls" from proposed wan't reinstall them again.

3. Added "focal-proposed" to "/etc/apt/source.list". Update executed with: "apt-get update"
4. Created "/etc/apt/preferences.d/proposed-updates" (See EnableProposed Wiki)
5. Install from focal-proposed: "apt-get install ubuntustudio-controls/proposed"
6. "ubuntustudio-controls (1.12.5~20.04.1)" No problems with the installation.
7. Started "ubuntustudio-controls" from the desktop. Starts without errors.
8. Selected Audio Setup / Jack Master Settings
9. Jack Master Devices (no USB) dropdown list shows all audio devices as required.

Same testing on another machine where all audio drivers already had a description:
No problems with the new version "ubuntustudio-controls (1.12.5~20.04.1)".

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https://bugs.launchpad.net/bugs/1872187

Title:
  [SRU] ubuntustudio-controls crashed with IndexError in
  refresh_dropdowns(): list index out of range

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