Installed Ubuntu 11.10 Desktop x64 Edition on Parallels Desktop
1. for parallels tools to work normally.
Before installing the parallels tools, add a soft link /usr/lib64 to /usr/lib
sudo ln -s /usr/lib /usr/lib64
2. for Coherence to work, get the Gnome fall back package, and logout, then log back in with Gnome Classic (no effect)
sudo apt-get install gnome-session-fallback