Download build and install GHDL on Ubuntu 18.04 (tested 2018-09-28)

download-buidl-and-install-ghdl.sh

#!/bin/sh
#
# download-buidl-and-install-ghdl.sh
#
# It took about 5 minutes on my laptop (2018-09-28).

sudo apt update
sudo apt install -y git make gnat zlib1g-dev
git clone https://github.com/ghdl/ghdl
cd ghdl
./configure --prefix=/usr/local
make
sudo make install
echo "$0: All done!"

# See the quick start guide to learn basic usage
# https://ghdl.readthedocs.io/en/latest/using/QuickStartGuide.html
# 
# The two main commands are `ghdl -a` (analyse) and `ghdl -r` (run)
# If you copied the full adder example from the quick start guide into
# `full-adder.vhd` and `full-adder_tb.vhd`, you can use ghdl like so:
#
# ghdl -a full-adder.vhd full-adder_tb.vhd
# ghdl -r adder_tb
# > full-adder_tb.vhd:55:16:@8ns:(assertion note): end of test
#

Thank you!