I do have Thinprint enabled on my guests and a wireless LAN printer connected to my internal LAN. In Windows guests there is no problem to choose the printer from the dropdown menu and send the document to the printer: the printer will correctly and fast printing it.
It is not the same with Linux guests, all the Linux guests (I try with Ubuntu, LDMint, Archlinux, Gentoo, etc etc): the thinprint is correctly seen in the printers dropdown menu when I do choose to print a document, then the result varies from a silent printing abort (it show like if it print, then it don't print), a Orphaned Thinprint Client error and in the better case, the document seems to print, a signal is sent to the printer and then it will not print.
Now, whats wrong with my setup and what I need to do to enable Thinprint support on my *NIX guests?