I finally managed to install QGIS 3 on my favourite linux distro. The magic incantation was found here:

sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-key 073D307A618E5811

echo “deb http://qgis.org/ubuntugis xenial main” > /etc/apt/sources.list.d/qgis.list

echo “deb-src http://qgis.org/ubuntugis xenial main” » /etc/apt/sources.list.d/qgis.list

echo “deb http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu xenial main” > /etc/apt/sources.list.d/ubuntugis-unstable.list

echo “deb-src http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu xenial main” » /etc/apt/sources.list.d/ubuntugis-unstable.list

sudo apt-get update

sudo apt-get install qgis python-qgis qgis-plugin-grass

for some plugins QtWebKit is needed:

sudo apt-get install libqtwebkit-dev python3-pip python3-setuptools

pip install jupyter==1.0.0 qtconsole

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To be able to develop Python scripts I did the following:

apt autoremove echo “deb http://qgis.org/ubuntugis xenial main” > /etc/apt/sources.list.d/qgis.list echo “deb-src http://qgis.org/ubuntugis xenial main” » /etc/apt/sources.list.d/qgis.list echo “deb http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu xenial main” > /etc/apt/sources.list.d/ubuntugis-unstable.list echo “deb-src http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu xenial main” » /etc/apt/sources.list.d/ubuntugis-unstable.list sudo apt-get update sudo apt-get install aptitude aptitude install qgis python-qgis javascript-common liblwgeom-dev python3-tk apt-get install Qt5-Support apt-get install qt5-designer sudo apt-get install qttools5-dev-tools sudo apt-get install python3-pyqt5.qtsql sudo apt-get install postgresql-client libpq-dev pgadmin3 sudo apt install libqt5sql5-psql sudo apt install pyqt5-dev-tools