The T5 has a different configuration that all other palm models. To use it:

gksudo gedit /etc/udev/rules.d/10-custom.rulesa

The followinf is for all palm devices except T5:

BUS="usb", SYSFS{product}="Palm Handheld*", KERNEL="ttyUSB*", NAME{ignore_remove}="pilot", MODE="666"

For the T5 use instead:
BUS="usb", SYSFS{product}="palmOne Handheld*", KERNEL="ttyUSB[13579]", SYMLINK="pilot

Save and add the pilot-applet

In Devices, check to be USB and

/dev/pilot (not: /dev/ttyUSB1)
57600



To install .prc files use gpilot-install-fole -later filename.prc
and synchonize

sometimes errors occur (kill the gpilotd processes). 
ps -A | grep gpilotd

kill processidnumbrer