Things I've installed have been running well, until now.. but here's some advice: Don't install anything that needs Mathlib.prc installed with it. The gvm launcher hangs, and nothing I did could fix that. Killed gvm and gvm-launcher from xterm. After that it would start, but would hang starting applications. De-installed the app. needing Mathlib, no help. I scratched my $HOME/.gvm directory, still no luck (it did start up with the EULA, just as a first start). Reboot, no good. Re-installed garnet-vm, no good. In the end I fixed it by doing all of the above: rm -rf /home/user/.gvm, dpkg --purge garnet-vm, re-installed it from AM, _and_ rebooted. That fixed it.

Morale: Stay away from Mathlib.prc (at least I think that was the culprit). I've reported my findings to the compatibility survey on Access' site.