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Homepage
https://www.openttd.org/

Install from snap
https://snapcraft.io/install/openttd/ubuntu

sudo snap install openttd

Install from APT package
http://www.openttd.org/en/download-stable
[embed_url: https://raw.githubusercontent.com/panticz/installit/master/install.openttd.sh]

Install newest Version
wget https://raw.githubusercontent.com/panticz/installit/master/install.openttd.sh -O - | bash -s -- -n

Notes

# sudo apt-get install -y libsdl1.2debian

# pre configure
debconf-set-selections <<\EOF
openttd openttd/datafiles select
EOF

# install openttd
sudo apt-get install -y openttd timidity
wget http://www.tt-ms.de/downloads/ttdwin302011.rar -P /tmp
mkdir /tmp/ttd
unrar x /tmp/ttdwin302011.rar /tmp/ttd

# copy data
sudo cp /tmp/ttd/*.grf /tmp/ttd/*.cat /usr/share/games/openttd/data
sudo cp /tmp/ttd/gm/* /usr/share/games/openttd/gm

# clean up
rm /tmp/ttdwin302011.rar
rm -r /tmp/ttd

Links
http://wiki.ubuntuusers.de/Spiele/OpenTTD
http://www.tt-ms.de/downloads/