Switched to Ubuntu

Having issues with Apache on Centos, so switched to Ubuntu.
Need to re-enable ruby and postgres install and make sure that works still

Signed-off-by: Ippoippo <ippoippo-software@ippoippo-eco.com>
Reenabled postgres and rbenv

Signed-off-by: Ippoippo <ippoippo-software@ippoippo-eco.com>