That is an old version and we need to do a few things to get you on the path to a supported version. You will need to update your /etc/apt/sources.list
The correct address is old-releases.ubuntu.com
Edit your /etc/apt/sources.list manually or from Software & Updates ( software-properties-gtk ) and run
sudo apt-get update # update package cache
sudo apt-get dist-upgrade # install newest dependencies for 17.10
sudo do-release-upgrade # upgrade to 18.04 LTS
The correct address is old-releases.ubuntu.com
Edit your /etc/apt/sources.list manually or from Software & Updates (software-properties-gtk) and run
sudo apt-get update # update package cache
sudo apt-get dist-upgrade # install newest dependencies for 17.10
sudo do-release-upgrade # upgrade to 18.04 LTS
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