I'll confirm K's report and views. The 'breakage' I reported above resulted from grub not updating the boot menu to default to the most recent kernel, which caused me to boot to the 2.6.12-10-386 kernel instead.
Whatever the problem was, it was transient. -- Some modules are not automatically loaded after dist-upgrade from 5.10 to 6.06 beta https://launchpad.net/bugs/41144 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs