Install postgresql-9.4
$ sudo apt-get install postgresql-9.4
Then psql version should be 9.4.x
$ psql --version
| alias b='bundle' | |
| alias be='b exec' | |
| alias ber='b exec rake' | |
| alias beu='b exec uniqfrd' | |
| alias bi='b install --path vendor' | |
| alias bil='bi --local' | |
| alias binit='bi && b package && echo '\''vendor/ruby'\'' >> .gitignore' | |
| alias bu='b update' | |
| alias create-repo='touch .gitignore && git add .gitignore && git commit -m '\''Created repo'\'' && git checkout -b develop' | |
| alias g='git' |