我想在 Ubuntu xenial 16.04 上安装带有 PostgreSQL 9.6 的 PostGIS 2.3：
sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt trusty-pgdg main" >> /etc/apt/sources.list'
wget --quiet -O - http://apt.postgresql.org/pub/repos/apt/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
然后安装postgis：
sudo apt-get install postgresql-9.6-postgis-2.3
但这返回：
The following packages have unmet dependencies:
postgis : Depends: libgdal1h (>= 1.9.0) but it is not installable
Depends: libgeos-c1 (>= 3.4.2) but it is not installable
Depends: liblwgeom-2.3-0 (>= 2.0.0) but it is not going to be installed
我知道有点晚了，但对于那些遇到这个问题的人，请尝试
使用 16.04 时设置 xenial-pgdg 而不是 trusty-pgdg
sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt xenial-pgdg main" >> /etc/apt/sources.list'
wget --quiet -O - http://apt.postgresql.org/pub/repos/apt/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
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