While I fully intend to go over my full experience upgrading to the latest development release of Kubuntu, one of the things that I first noticed was that Privoxy didn't seem to work or to be speaking with Tor, preventing me from that lovely "anonymous" browsing experience. I noticed that in the upgrade the ever important "forward-socks4a / localhost:9050 ." line in /etc/privoxy/config wasn't in the upgraded version (actually, it shouldn't be). Apparently during the upgrade, I told it to clobber my config file with the one distributed, saving my old version (luckily) to /etc/privoxy/config.dpkg-old. Once that I added that line back, I'm now able to surf a bit more safely.
Upon hearing about yesterday's release of Kubuntu 6.06, I decided to upgrade from the previous release, Kubuntu 5.10. I'd like to say that it went off without a hitch, but it didn't. It did, however, go mostly well, and I realized that my problem was that I continued to use applications while Adept installed the new packages. I couldn't install all the packages, and I ended up with a minorly disfunctional kernel that wouldn't allow ndiswrapper to load properly, preventing me from using my internal wireless card. Once I rebooted (and used a spare PCMCIA wireless card to gain connectivity), I was able to finish installing the rest of the packages that had not finished properly and rebooted again. Everything pretty much worked, but I'm having to tweak some lost settings, most notably in KMail. Other than that, it's been working out fine!