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The official QGIS installation documentation is a little hard to follow, because it doesn't give a detailed example.

@zorkerz provided an answer to my installation question for Ubuntu 15.04. I modified these instructions to 18.04. Is my interpretation correct?

To install the newest version of QGIS, add the QGIS repositories to the /etc/apt/sources.list file:

sudo nano /etc/apt/sources.list

Arrow the cursor to the bottom and insert these lines:

deb http://qgis.org/ubuntu bionic main
deb-src http://qgis.org/ubuntu bionic main

After those commands, I followed the rest of the instructions on the official QGIS installation page starting with the following.

"After that type the commands below to install QGIS:"

sudo apt update
sudo apt install qgis qgis-plugin-grass

While completing the step to verify the fingerprint, the following part of the output seemed off:

gpg: key 51F523511C7028C3: 1 signature not checked due to a missing key gpg: key 51F523511C7028C3: "QGIS Archive Automatic Signing Key (2019) " not changed gpg: Total number processed: 1 gpg: unchanged: 1

When adding the key, the following part of the output was concerning. Is this a problem on my end or for QGIS to resolve?

gpg: key 51F523511C7028C3: 1 signature not checked due to a missing key

OpnSrcFan
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2 Answers2

3

You missed a part in the installation. This adds a fingerprint:

wget -O - https://qgis.org/downloads/qgis-2019.gpg.key | gpg --import
gpg --fingerprint 51F523511C7028C3
sudo gpg --export --armor 51F523511C7028C3 | apt-key add -

(The 2018 key is no longer valid. I did not find a 2020 key yet but the 2019 one will be valid) Then do

sudo apt update
sudo apt install qgis qgis-plugin-grass
Rinzwind
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0

I encountered a similar problem 

E: This command can only be used by root. gpg:

Rinzwind's answer worked with a small modification for me; added a sudo to the apt-key add - part.

sudo gpg --export --armor 51F523511C7028C3 | sudo apt-key add -

and after updating apt sources this minor change:

sudo apt-get install qgis python-qgis qgis-plugin-grass
Gryu
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Drew Hill
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