Testing Lubuntu 11.04 (Natty Narwhal), part 2.

Packages in: g2ipmsg, libxp6, openmotif_2.3.3-2_i386, icaclient_11.100_i386.patched.deb

1. Install IPMSG, package name: g2ipmsg. Good thing it's in the Synaptic already.

2. Citrix Receiver now.
Resource link in Citrix: http://support.citrix.com/article/CTX125285

sudo dpkg -i openmotif_2.3.3-2_i386.deb

yields:
Selecting previously deselected package openmotif.
(Reading database ... 84668 files and directories currently installed.)
Unpacking openmotif (from openmotif_2.3.3-2_i386.deb) ...
dpkg: dependency problems prevent configuration of openmotif:
openmotif depends on libxp6; however:
Package libxp6 is not installed.
dpkg: error processing openmotif (--install):
dependency problems - leaving unconfigured
Processing triggers for man-db ...
Errors were encountered while processing:
openmotif

so...

sudo apt-get install libxp6

then repeat the openmotif package installation, which succeeds this time.

Next, install the Citrix ICA client.

sudo dpkg -i icaclient_11.100_i386.patched.deb

Accept the EULA question (YES), and the installation proceeds.

Citrix Receiver is found under the Internet sub-menu.