libXm.so.4 not in Ubuntu affecting Citrix Receiver

Unfortunately, Ubuntu only provide the obsolete libmotif3 version and the not the current version 4 that the receiver is built against. The workaround below will get you going...

Install libmotif3:
sudo apt-get install libmotif3

Created symlink:
sudo ln -s /usr/lib/libXm.so.3.0.2 /usr/lib/libXm.so.4

Applications -> Internet -> Citrix Receiver = Working fine!