ubuntu software update - failed to load files

It's the fact that google chrome dropped support for 32-bit(i386) versions for linux that's causing your error/waing.
The design of googles sources.list looked for packages for both 64-bit and 32-bit, regardless of what version you ran.

Easy fix, choose between two methods, really.
easy or not as easy.

Easy: Download a fresh version of chrome from google chrome's web site.
Uninstall the version you have, and reinstall the new version.

Not as easy: edit the google chrome sources.list file in
/etc/apt./spurces.list.d/google-chrome.list
and change the line from

deb http://dl.google.com/linux/chrome/deb/ stable main

deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main

Note that if you are ruing a 32-bit system, then forget about any of this and uninstall google chrome.
As 32-bit google chrome on linux will never be updated ever again, and should now be considered unsafe.