Error message and restart when contacting running opera

  • I have opera running and give on the command line: opera file-name
    Usually the file will be displayed in a new tab.
    However, quite often opera terminates and is restarted again.
    The terminating instance displays:
    Request for unknown Channel-associated interface: ui::mojom::GpuMain

    The opera version:
    44.0.2510.1449 - Opera is up to date
    Update stream: Stable
    System: Ubuntu 16.04.2 LTS (x86; MATE)

    Any ideas?
    ulrich

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