I have ubuntu 12.10, which until today was working correctly. In particular, I could use Firefox to access the Internet (and my mail) through my wireless router.
Today I received a notice advising me that additional software was available. I chose to download the software. At the completion of the download I was asked to reboot the computer, which I did. When the reboot finished, I received the message "Network Disconnected". and I can no longer access the Internet with Firefox.
When I select the "Network" icon, the option "Wireless" has disappeared, I and I can find no way to reconnect via my wireless router.
Can anyone help? Thank you very much.