Optipng is in the Ubuntu repositories but is you want an up to date version then it can be worth installing Optipng from source. This is essentially a script but you can use the commands on there own if you want.
wget --quiet http://downloads.sourceforge.net/project/optipng/OptiPNG/optipng-0.7.3/optipng-0.7.3.tar.gz tar xf optipng-0.7.3.tar.gz cd /root/scripts/optipng-0.7.3 ./configure > /dev/null 2>&1 make > /dev/null 2>&1 cp /root/scripts/optipng-0.7.3/src/optipng/optipng /usr/bin/ ln -s /usr/local/bin/optipng /usr/bin/optipng rm /root/scripts/optipng-0.7.3.tar.gz rm -rf /root/scripts/optipng-0.7.3
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