Just try 

sudo do-release-upgrade

if you get this

An upgrade from 'zesty' to 'bionic' is not supported with this tool.

you have to upgrade manually. Because 17.10 is end of life.

========================================

Install 

aptitude 

on 17.04 system with:

sudo apt-get install aptitude

If nothing else helps you can change old-releases.ubuntu.com back to archive.ubuntu.com and then zesty to arftul:

sudo sed -i -re 's/old-releases.ubuntu.com/archive.ubuntu.com/g' /etc/apt/sources.listsudo sed -i -re 's/zesty/artful/g' /etc/apt/sources.list

Or just change /etc/apt/sources.list to

deb https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ artful main restricted universe multiversedeb-src https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ artful main restricted universe multiversedeb https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ artful-security main restricted universe multiversedeb-src https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ artful-security main restricted universe multiversedeb https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ artful-updates main restricted universe multiversedeb-src https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ artful-updates main restricted universe multiversedeb https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ artful-backports main restricted universe multiversedeb-src https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ artful-backports main restricted universe multiverse

And then upgrade system with

sudo aptitude updatesudo aptitude dist-upgrade

 

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