Well, I managed to upgrade to Ubuntu Edgy 6.10, though the path to this upgrade was a bit rocky. I've tried to get the ATI proprietary ("fglrx") drivers working with Beryl, but apparently, the latest release of Beryl has something that is incompatible with the ATI driver. After about 4 attempts at making this Edgy-fglrx-XGL-beryl combination work, I decided to give the open-source "radeon" driver a try with the AIGLX extension to X.org.
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