Hi MLR,

well, if kgtk-qt3-trinity is not installed, here is another potential 
source of problems: gtk-qt-engine-trinity and gtk3-tqt-engine-trinity. In 
Trinity Control Center, check the GTK engine setting and set it to 
another engine, than QT-Engine and TQT-Engine.

Cheers
-- 
Sl�vek

On Sunday 02 of December 2018 08:38:04 MLR wrote:
> Hello Sl�vek,
>
> the package kgtk-qt3-trinity is not installed.
>
>
> Have a nice day
>
> On 01.12.18 12:01, Sl�vek Banko wrote:
> > Hi MLR,
> >
> > the problem with start arduino ide is definitely not caused by
> > writing to /etc/tqt3/tqt_plugins_3.5rc.tmp. This message only diverts
> > attention from the real problem. Please do:
> >
> > 1. apt-get purge kgtk-qt3-trinity
> > 2. log out from TDE
> > 3. log in again to TDE
> > 4. try to run arduino ide
> >
> > Cheers
>