if the unsupported was on the section of pclinux control center where you select your scanner, this means that sane doesn't have drivers for your scanner, sane is who supports scanners on linux and not every model is supported
http://www.sane-project.org/sane-mfgs.html#Z-HEWLETT-PACKARDin that page it mentions that the gensys driver might support it some day but not at the moment
my personal experience with a hp 2400 with supposedly gensys support doesn't make me optimistic about that, i have it since 2006 and still doesn't work with that driver
hp rarely gives good support to scanners, some models work but others won't, sometimes multifunctional printers have better luck with their scanners
for very rare models like mine someone made a driver and the driver works but will make your install unsupported and no warranties that scanner will work or won't make the install unstable
scanners are one of those types of hardware that makes users boot into their windows installs to make job done
as always buy hardware with linux support is better but not much people is buying scanners right now and the few on sale are mostly developed for windows or mac only
some people just decide to take pictures with high resolution cameras or install apps on their phones to convert it on very basic scanners
scanners are becoming a rare hardware that not much people use apart from a multifunctional printer to make copies
