I have already Gambas and it works OK.
QT4Configuration is used to change the theme in Ubuntu classic and so
should do QT5ct.
You have Ubuntu classic (Unity) and you can use the transparency?
Make this test:
Create a new graphic project.
Draw a label (label1)
Above the label to cover it draws a tex
Try the following command.
*sudo add-apt-repository -y ppa:gambas-team/gambas3 && sudo apt-get update
&& sudo apt-get -y install gambas3*
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On Ubuntu 16.04 I had understood that QT5 Configuration Tool (qt5ct) was
for QT5 as QT4 Configuration for QT4.
I obtained from PPA as well:
sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install qt5ct
As soon as installed, there was to be added to ~/.profile this