Since upgrading my laptop (a Dell Latitude 420) last month to Gutsy (code name for Ubuntu 7.10), my wireless network has been crapping out a lot. I try to never shut down; I use suspend instead. But one out of five times when I wake the laptop back up after being suspended, the wireless connection breaks beyond repair. Restarting the network services doesn’t fix it, reloading the driver doesn’t fix it – Only a reboot fixes it.
So after much frustration, I configured Update Manager to install pre-release updates in addition to the standard updates to see if there was a fix that hasn’t officially been released yet. Within minutes it said there was a pre-release update to Network Manager. I installed it… problem solved. It has been 3 days and the wireless network has been perfect. No weirdness from the 100 or so other pre-release updates it’s pulled down either.
Conclusion: pre-release updates are good.
System > Administration > Synaptic Package Manager > Settings > Repositories > Updates > Pre-release updates (gutsy-proposed)