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I had QGIS 3.10 installed on Ubuntu 18.04. Hoping for ECW support I ran the bash code located

here. While this code executed without error QGIS 3.10 is not available on my computer anymore.

After running the installation again using

sudo apt-get install qgis python3-qgis qgis-plugin-grass

I get the following error:

The following packages have unmet dependencies: python3-qgis : Depends: python3-qgis-common (= 1:3.4.15+28bionic-ubuntugis) but it is not going to be installed qgis : Depends: qgis-providers (= 1:3.4.15+28bionic-ubuntugis) but it is not going to be installed Depends: qgis-common (= 1:3.4.15+28bionic-ubuntugis) but 1:3.10.2+28bionic-ubuntugis is to be installed qgis-plugin-grass : Depends: qgis-plugin-grass-common (= 1:3.4.15+28bionic-ubuntugis) but 1:3.10.2+28bionic-ubuntugis is to be installed E: Unable to correct problems, you have held broken packages.

How do I install QGIS given this situation?

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    You have to fix broken packages. You can search how do that in maketecheasier.com/fix-broken-packages-ubuntu or whatever similar post.
    – xunilk
    Commented Mar 6, 2020 at 3:29
  • Thanks @xunilk, running sudo apt update --fix-missing reinstalled the missing dependencies. If you post your comment as an answer I will mark it as answered.
    – GBG
    Commented Mar 6, 2020 at 16:25
  • You're welcome. I posted my comment as an answer.
    – xunilk
    Commented Mar 6, 2020 at 16:44

2 Answers 2

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Before running the installation of QGIS 3 again, you have to fix broken packages. You can search how do that in maketecheasier.com/fix-broken-packages-ubuntu or whatever similar post.

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From here:

To fix this on my side, I had to uninstall libproj* manually

sudo apt remove libproj15 libproj-dev libproj19

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