You can try to edit a small file un hplip following this indication https://launchpadlibrarian.net/181010246/process-events-for-systray.patch. This worked for me.
On Thursday 15 October 2015 13:35:34 newbeewan@nativobject.net wrote:
> Hi,
>
> When loading, HPLIP complains about "No system systray", but the icon is
> shown and fonctional in plasma 5 systray !...
>
> If I push ok to the button on the dialog box, it close completly !
>
> Is it possible to tell it to not check the systray ?
The problem here lies in sni-qt. If you restart the hplip app that provides
the icon it will work.
Same happens to me with Dianara: if started while opening the session it
fails, but if I restart it later it works.
So feel free to open a bug against sni-qt :)
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