sudo apt-get install postgresql-9.5-postgis-2.5
returns a series of errors:
The following packages have unmet dependencies:
postgresql-9.5-postgis-2.5 :
Depends: libgdal1i (>= 1.9.0) but it is not installable
Depends: libjson-c2 (>= 0.11) but it is not installable
Depends: liblwgeom-2.5-0 (>= 2.5.0~beta1) but it is not going to be installed
Depends: libproj9 (>= 4.9.0) but it is not installable
Depends: libsfcgal1 (>= 1.2.0) but it is not installable
E: Unable to correct problems, you have held broken packages.
I had never encountered a not installable
exception to date so I ma not sure of consequences of different possible actions… Attempting lower versions leads to the same result. How can PostGIS get safely installed then?
Update
An attempt was also made, making a fresh installation of a Ubuntu 18.04 VM [following these instructions][1]
The source of the error was in adding the repository to sources.list
sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt xenial-pgdg main" >> /etc/apt/sources.list'
which should be for 18.04
sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt bionic-pgdg main" >> /etc/apt/sources.list'
[to butter things up even more, and attempt was made with bioni-pgdg main
leading to its own set of errors]!
Best Answer
Unmet Dependencies
The UbuntuGIS Quickstart Guide lists a few things that need to be done before installing their packages (these packages include PostGIS).
The first is that your
/etc/apt/sources.list
must include the "universe" and "multiverse" repositories. Edit that file to add them. There should already be a line that lists "main". In the end, it will look like this:This is where all of your dependencies come from.
Install Repository
After that, you need to install the UbuntuGIS repository
Once this is done, you should be able to install postgis in the typical way:
Note: there will be a lot of items to install.