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I run into an error:
The following packages have unmet dependencies:
postgresql-12-postgis-2.5 : Depends: libgdal20 (>= 2.0.1) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Then when I try to install libgdal20, I run into more dependency issues
The following packages have unmet dependencies:
libgdal20 : Depends: gdal-data (>= 2.2.3+dfsg-2) but it is not going to be installed
Depends: libhdf5-100 but it is not going to be installed
Depends: libnetcdf13 (>= 4.0.1) but it is not going to be installed
Depends: libogdi3.2 (>= 3.2.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Can someone guide me through the correct way to install postgis?
Update
This is the result of my sudo apt update. It is followed by a lot of lines of warning that look like this Target .... is configured multiple times in /etc/apt/sources.list:53 and /etc/apt/sources.list:
$>sudo apt-get update
Hit:1 http://fr.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://fr.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:3 http://fr.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:4 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal InRelease
Hit:5 http://archive.ubuntu.com/ubuntu bionic InRelease
Hit:6 http://apt.postgresql.org/pub/repos/apt bionic-pgdg InRelease
Hit:7 http://archive.ubuntu.com/ubuntu bionic-security InRelease
Hit:8 http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu focal InRelease
Hit:9 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Ign:10 http://apt.postgresql.org/pub/repos/apt bionioc-pgdg InRelease
Hit:11 http://apt.postgresql.org/pub/repos/apt trusty-pgdg InRelease
Err:12 http://apt.postgresql.org/pub/repos/apt bionioc-pgdg Release
404 Not Found [IP: 147.75.85.69 80]
Hit:13 https://packages.cloud.google.com/apt cloud-sdk InRelease
Hit:14 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Hit:15 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:16 http://us.archive.ubuntu.com/ubuntu bionic-security InRelease
Hit:17 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease
Ign:18 https://artifacts.elastic.co/packages/5.x/apt stable InRelease
Hit:19 https://artifacts.elastic.co/packages/5.x/apt stable Release
Reading package lists... Done
E: The repository 'http://apt.postgresql.org/pub/repos/apt bionioc-pgdg Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Remove the existing repository first, you had the one from Bionic, that's what causing the problem to begin with. Assuming it is resided on /etc/apt/sources.list.d/pgdg.list.
sudo rm /etc/apt/sources.list.d/pgdg.list
Now add the correct repository for your system.
echo "deb http://apt.postgresql.org/pub/repos/apt/ focal-pgdg main" | sudo tee /etc/apt/sources.list.d/pgdg.list
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
sudo apt update
sudo apt install postgresql-12-postgis-2.5
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