PSQL95/96-ubuntu18.04

 Ubuntu 18.04 (bionic)

https://www.programmersought.com/article/30754428310/

sudo add-apt-repository "deb http://apt.postgresql.org/pub/repos/apt/ bionic-pgdg main"
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update

sudo apt-get install postgresql-9.6
or
sudo apt-get install postgresql-9.5
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Found a tutorial, highly recommended: https://www.jianshu.com/p/35443c41ca56