I have a Dell Inspiron 5100 laptop. It has been running Breezy fine with no issues. I have been trying to get Dapper installed. I boot from the CD select language and keyboard layout, but when it gets to the "Detecting network hardware" screen it locks up and won't go any further. I can't even ALT-CTRL-F2 to get to another console to see what's going on.
If I disable my Wireless network card, which is a broadcom chipset (Dell TrueMobile 1400 Dual Band WLAN mini-PCI Card. I have been using ndiswrapper with the bcmwl5.sys driver from Dell in Breezy), the installation works fine. In that case, if I re-enable my wireless card and attempt to boot it locks up at hardware detection during boot and won't go any further. Disabling again allows a normal boot.
After installing and booting with the card disabled, I did an apt-get update, apt-get upgrade, re-enabled the card and still had the same problem.
The live CD boots normally. I don't have wireless available, but I can at least get to the desktop.
I'm not sure what other information to post, but I'll get whatever info you need from me.
This issue is still occuring with Dapper Beta 1. I used the system upgrade feature to upgrade my breezy to dapper and am running dapper, but I still cannot get the system to boot if the wireless card is enabled.