I have used the instructions here marked Tested 29/06/2018 to install QGIS 3.4.4 on Ubuntu 16.04. While QGIS installs nicely I get an error on installing qgis-plugin-grass. Subsequently the Grass tools listed in the processing window all throw errors.

Upon installation I get the following error...

The following packages have unmet dependencie: qgis-plugin-grass :
Depends; grass760 but it is not installable.  
E: Unable to correct problems, you have held broken packages.

I have tried reinstalling using aptitude but this did not make any difference. How do I install the grass760 dependencies and qgis-plugin-grass?

  • Can you try again? Meanwhile GRASS GIS 7.8.0 with Python 3 support has been made available, also for Ubuntu.
    – markusN
    Sep 15 '19 at 20:03

If you stick to the ubuntugis-unstable ppa (with nothing from qgis.org in your sources list), you should be able to install QGIS 3.4.6 solely from the ppa.

BTW QGIS 3.4.4 is not the latest QGIS-ltr version; I wonder where you have that from. Maybe you should run apt-cache policy qgis to see what is available for you.

  • Should I purge QGIS and paths to the repositories and just install using these commands then? sudo add-apt-repository ppa:ubuntugis/ubuntugis-unstable sudo apt-get update sudo sudo apt-get install qgis python-qgis qgis-plugin-grass
    – GBG
    Apr 18 '19 at 4:56
  • Yes, go ahead. And keep an eye on any error messages.
    – AndreJ
    Apr 18 '19 at 5:34

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