The default OpenSSL version on Ubuntu Server 14.04 is still OpenSSL 1.0.1f, and it cannot be upgraded using apt-get, so it can only be installed by compiling.
/usr/bin/openssl version
OpenSSL 1.0.1f 6 Jan 2014
wget https://www.openssl.org/source/openssl-1.0.2l.tar.gz
tar -xzvf openssl-1.0.2l.tar.gz
cd openssl-1.0.2l
sudo ./config
sudo make install
sudo ln -sf /usr/local/ssl/bin/openssl `which openssl`
/usr/bin/openssl version
OpenSSL 1.0.2l 25 May 2017
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