Unable to upgrade to Ubuntu

one ErrMsg:

A problem occurred during the update. This is usually some sort of network problem, please check your network connection and retry.


2nd ErrMsg:

W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/...wily/InRelease Unable to find expected entry 'main'/binary-amd64/Packages' in Release file (Wrong sources.list entry or malformed file)
, E:Some index files failed to download. They have been ignored, or old ones used instead.

My network consists of one ubuntu compact laptop computer, and printer.
Unless it means my internet connection...which works fine.

Posting the contents of "/etc/apt/sources.list" might get you some help from someone familiar with Ubuntu. Note the error in your output "malformed line", something's wrong with an entry. Which Ubuntu are you using 14.04 or 15.10?

As yancek has asked, what is your current version of Ubuntu? Furthermore, are you attempting to upgrade to 16.04?
Currently you cannot upgrade directly from 14.04 to 16.04.

Check the Ubuntu site below which explains upgrading from 14.04 to 16.04. Both are LTS so can be directly upgraded.

https://wiki.ubuntu.com/XenialXerus/ReleaseNotes

Originally Posted by yancek Check the Ubuntu site below which explains upgrading from 14.04 to 16.04. Both are LTS so can be directly upgraded. https://wiki.ubuntu.com/XenialXerus/ReleaseNotes

But not now: "14.04 LTS to LTS upgrades will be enabled with the 16.04.1 LTS point release, in approximately 3 months time.". (emphasis added)

It looks like you are upgrading to 15.10, wily werewolf. I would suggest doing a new clean install of
16.04 which is an improvement over 15.10.