That will happen with every kernel update. It looks like you are in Karmic and the update took you to kernel 2.6.31-19-generic. The new directory:
does not have the compiled wacom.ko in it like:
does after you used the copy (cp) command:
First try copying your compiled wacom.ko from your patched unpacked source code tar again. That should/may work, otherwise you'll have to recompile. If you have to recompile you might want to look at the links in post #384. They are to the patch sets on the other P & T thread that will get your touch and pad working.
sudo cp src/2.6.27/wacom.ko /lib/modules/$(uname -r)/kernel/drivers/input/tablet/
You'll have to do that until the driver supports the P & T, hopefully in Lucid.