Re: more info on: "wifi not working on ubuntu, when it did before upgrade"

[Jirka Klimes <jklimes redhat com>]

On Thursday 02 of December 2010 19:33:42 Alan White wrote:

> (eth0)' (eth0) as default for routing and DNS.
> Nov 25 09:29:29 awhite NetworkManager: <info>  Activation (eth0)
> successful, device activated.
> Nov 25 09:29:29 awhite NetworkManager: <info>  Activation (eth0) Stage 5
> of 5 (IP Configure Commit) complete.
> Nov 25 09:29:29 awhite wpa_supplicant[1060]: Failed to initiate AP scan.
> Nov 25 09:29:29 awhite connmand[2233]: wlan0 SCANNING

According to the log, you are running both network-manager and connman, which 
could cause wpa_supplicant to fail in scanning APs.
You should run just one of the managers. Follow
https://wiki.ubuntu.com/ConnMan/Installation
to configure your machine properly.

Jirka