You can actually check that alone:
Go to http://hplipopensource.com/hplip-web/supported_devices/index.html
Select the type and the model of the printer and click "continue"
Check that "Support level" is "Full", that "Recommended?" is "Yes", that
"Driver plug-in" is "None" and that "Requires firmware download" is "No" (do
not forget those last two items at the bottom of the page)
You can also look at "Minimum HPLIP version" to see what version of Trisquel
will give you an out-of-the-box support (Trisquel 6's repository contains
HPLIP 3.12.2; Trisquel 7's repository contains HPLIP 3.14.3)
