8bab694 Invoke xvfb-run with -a to avoid random failures with the latter one

Authored and Committed by churchyard 5 years ago
    Invoke xvfb-run with -a to avoid random failures with the latter one
    
    See https://stackoverflow.com/questions/30504274/xvfb-run-line-171-kill-25939-no-such-process
    
        
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