Further information:
I ran "SANE_DEBUG_PLUSTEK scanimage -L" and got:
james at jamespc:~$ SANE_DEBUG_PLUSTEK=20 scanimage -L
[sanei_debug] Setting debug level of plustek to 20.
[plustek] Plustek backend V0.52-9, part of sane-backends 1.0.22
[plustek] Retrieving all supported and conntected device
Hello all,
I am running Debian Squeeze with a Canon LiDE20 scanner directly connected
via USB. I initially install sane via aptitude, but I've now removed that
and built sane-backends 1.0.22 from source. I hoped that building the
latest version of SANE might solve the problems I was experiencing,