Xerox:~$ sudo apt-get install beryl emerald-themes
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
beryl: Depends: emerald but it is not going to be installed or
aquamarine but it is not going to be installed or
heliodor but it is not installable or
yawd but it is not installable or
compiz-gnome but it is not going to be installed
Depends: beryl-manager but it is not going to be installed
emerald-themes: Depends: emerald (>= 0.1) but it is not going to be installed
E: Broken packages