Press "1" (Install Citrix Receiver for Linux 11.100)
Press "enter" ("/usr/lib/ICAClient" for destination)
Press "y" (Do you want to proceed?)
Press "y" (Proceed with installation?)
Read the disclaimer and press 1 (I accept)
Select defaults options. And quit when installation is done.
After this, /usr/lib/mozilla/plugins/npica.so should exists
Now it's time to get /usr/lib/ICAClient/wfcmgr work with your 64 bit installation.
For this you need to install ia32-libs
sudo apt-get install ia32-libs
There still one library missing (libXm.so.4)
If you do :
ldd /usr/lib/ICAClient/wfcmgr | grep not
Fetch libmotif3 32bits and make it look like libmotif4... (I know it's bad)
You will see that libXm is in fact missing. Unfortunately this library is not available for Ubuntu 10.04
You will need to fetch libmotif3 from a 32bit distribution and install it by hand in /usr/lib32, and make it look like the version 4 of openmotif using a symlink this is far from ideal... But it works.