C'est pour ça que je te l'ai envoyé. .-)
Oui, ça fonctionne bien sur ma Debian unstable aka sid avec plasma 5.
Non, non pas de Ubuntu sur mes machines, faut pas déconner, hein. 
Seulement sur les pc de madame et du dernier (kubuntu) ..
Possible qu'il te manque un paquet, mais l'installation avec pip est en principe autonome -> /usr/local/lib/python3.5/
Normalement pour que ça fonctionne bien il te faut ces dépendances: pyqt5-dev-tools python3-pip.
Avec mes paquets normalement si tu n'as pas désactivé les recommends ils devraient être installés, d'ailleurs sans il me semble que la commande pip3 ne fonctionne point.
Debian/control
Source: qelectrotech
Section: electronics
Priority: optional
Maintainer: Laurent Trinques <scorpio@qelectrotech.org>
Build-Depends: cdbs (>= 0.4.89) , debhelper (>= 9), quilt (>= 0.48), qtbase5-dev, quilt, qt5-qmake, libqt5svg5-dev
Standards-Version: 3.9.8
Homepage: http://qelectrotech.org/
Package: qelectrotech
Architecture: any
Depends: ${shlibs:Depends}, ${misc:Depends}
Recommends: qelectrotech-examples (= ${source:Version}), qelectrotech-data (= ${source:Version}), qttranslations5-l10n, pyqt5-dev-tools, python3-pip
Description: Electric schematic editor
QElectroTech is a Qt5 application written in C++ .
This program is helps you to design electric schematics.
It includes both a schematic editor and a symbol editor.
It uses XML files to store the produced contents.
Package: qelectrotech-data
Architecture: all
Depends: ${misc:Depends}
Recommends: qelectrotech (= ${source:Version})
Description: symbols needed for qelectrotech
QElectroTech is a Qt5 application written in C++ .
This program is helps you to design electric schematics.
It includes both a schematic editor and a symbol editor.
It uses XML files to store the produced contents.
.
This package provide symbols needed for qelectrotech.
Package: qelectrotech-examples
Architecture: all
Depends: ${misc:Depends}
Recommends: qelectrotech (= ${source:Version})
Description: examples files for qelectrotech
QElectroTech is a Qt5 application written in C++ .
This program is helps you to design electric schematics.
It includes both a schematic editor and a symbol editor.
It uses XML files to store the produced contents.
.
This package provide examples files for qeletrotech.
