Trying to get QGIS 3.8 to install on Ubuntu 19.04 caused some issues. I’m not sure if the following fix is a good way to go, but it allowed the install to proceed. And I kinda trust them.
With the relevant sources added to /etc/apt/sources.list
deb https://qgis.org/ubuntu disco main deb-src https://qgis.org/ubuntu disco main
I tried to pull the 2019 (and 2017) gpg keys
wget -O - https://qgis.org/downloads/qgis-2019.gpg.key | gpg --import gpg --fingerprint 51F523511C7028C3
These kept coming back with (unknown) so that they wouldn’t be trusted and therefore the software (I guess) wouldn’t be downloaded.
So I looked online and found this (https://trog.qgl.org/20091030/troubleshooting-gnupg-gpg-no-ultimately-trusted-keys-found/)
Following those instructions I edited the key to make it trusted:
1) gpg --edit-key [your key id] 2) type ‘trust’ to change the owner trust 3) select option 3, “I trust marginally” 4) type ‘quit’
Like I say, that’s probably a totally bad thing to do, but I needed the software and it got it installed.
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