Request documention to solve LL2.0 broken updates

[galen]

users with LL2.0 are being blocked from  upgrading due to broken repos.
I suggest having links for 2.0 users facing this issue

Code:

Failed to fetch http://dl.google.com/linux/chrome/deb/dists/trusty/main/binary-i386/Packages  404  Not Found [IP: 173.194.121.35 80]
Failed to fetch http://dl.google.com/linux/talkplugin/deb/dists/trusty/main/binary-i386/Packages  404  Not Found [IP: 173.194.121.35 80]
Failed to fetch http://repo.steampowered.com/steam/dists/trusty/steam/source/Sources  404  Not Found [IP: 198.164.26.139 80]
Failed to fetch http://repo.steampowered.com/steam/dists/trusty/steam/binary-amd64/Packages  404  Not Found [IP: 198.164.26.139 80]
Failed to fetch http://repo.steampowered.com/steam/dists/trusty/steam/binary-i386/Packages  404  Not Found [IP: 198.164.26.139 80]
Some index files failed to download. They have been ignored, or old ones used instead.

updates fail