Comment 2 for bug 367305

Confirming. This happened to me during the upgrade to Jaunty.

It happens after downloading the packages. The cause is that a package (perhaps NetworkManager) gets installed and causes the existing NetworkManager process to lose its internet connection (wired network). Since the majority of packages contain their own data to be installed, this is fine for most packages, but the b43-fwcutter refers to an online location which is unaccessible after NetworkManager goes down. The upgrade fails due to errors.

There are many approaches that can be taken to make the upgrade smoother. I'm not sure of the feasibility of each of these:
1) Do not mark b43-fwcutter as a package to upgrade. After the reboot, have jockey pop up a "detected hardware - get drivers" notification.
2) Avoid NetworkManager losing the internet connection during the upgrade.
3) Make NetworkManager the last package to be installed before reboot.
4) Have b43-fwcutter include the data to be installed, instead of referring to openwrt.org

dberry, if you want to make sure that everything was installed, simply run these commands:
$ sudo dpkg-configure --configure -a
$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo apt-get dist-upgrade