I just upgraded to the newest Ubuntu. Now my internet connection has gone haywire. I can only connect here in the library.
My house dsl connection doesn't show up. Before I had an icon top right. A click gave a list of possible connections, eth0, dsl, wireless. The connections are still in the list of Network Connections.

But under network connection I have only eth0 and the settings for the library here. It does not give me a choice of which connection to use.

How can I fix this??

You are saying that your wireless connection at home is no longer showing up?

Try running "ifconfig" and "iwlist scan wlan0" and posting the output

Lesson #1:

Before "upgrading" to the latest, take a full backup of your current installation [ Or, better, install the latest version to a new partition, and don't mix ~ between versions. ]

Then, if you are unhappy with the new installation (quite usual in my experience), you can always go back to your tried and trusted linux installation so you can have access to the 'net and find out what has gone wrong. That's what grub's boot menu is for.

Then, as you have the time and inclination, you can fine-tune and bug-fix your new version until you are happy to migrate your ~/* files over.

Do not click [Upgrade] and expect everything to be sweetness and light. It just doesn't work like that, whatever the developers say.

That said, (and I am guessing here) I suggest you uninstall "Network Manager" and install wicd instead.

Otherwise just uninstall "Network Manager" and get to grips with your /etc/network/interfaces file.

And robogymnast probably meant to say sudo iwlist scan