Installing Wicd in Ubuntu
Installing Wicd in Ubuntu is very simple. You just have to add the Wicd repository to the Ubuntu package manager. To open the package manager in Gnome, go to Administration > Synaptic Package Manager. When it appears, go to Settings > Repositories > Third Party Software > Add…, and enter the following line:
deb http://apt.wicd.net gutsy extras
where gutsy is your version of Ubuntu in lowercase (dapper, edgy, feisty, gutsy, hardy). Then, click Reload, and wait while the package lists are downloaded. Now, search for “Wicd”, and right click on it. Select Install, then press Apply, and Wicd will automatically be downloaded and installed for you. This will also keep you automatically up to date with the latest and greatest version of Wicd. Please note that this will remove network-manager, which is the default GNOME network manager and may cause loss of network connection temporarily.
In GNOME, to get the tray icon to automatically appear at boot, go to System > Preferences > Sessions. In the “Startup Programs” tab, click the “New” button. Give it a name (“Wicd” works fine). For the command, enter “/opt/wicd/tray.py”.
(taken from http://wicd.sourceforge.net)