Comment 8 for bug 209347

It's not that mounting by UUID isn't supported in dapper - it's just that the volumeid package isn't there, and instead was part of udev, which confuses the maintainer script are-we-upgrading logic.

Automatically setting labels is not a good idea; they should be reserved to be set by the sysadmin. If you set them automatically then you tend to end up in the sort of mess created by Anaconda where it makes your root filesystem have LABEL=/ so you get confusion if you try to dual-boot with a different version of the same operating system.