SOLVED! It turns out my problem was already reported, but since I didn't know which video chipset my clients have, I didn't know what to search for.
https://bugs.launchpad.net/ubuntu/+source/module-init-tools/+bug/208137 So, if your thin clients have VIA CLE266 chipsets--like the Devon IT NTAVO 6020P's--add vt8623fb to the blacklist as explained in the bug report. Todd -- edubuntu-users mailing list edubuntu-users@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/edubuntu-users
