Lexmark x73. Failed to scan. Unable to connect to scanner. 12.04 xfce

Ubuntu 12.04 ubuntustudio (xfce) Lexmark x73 prints OK but no scan. Have searched the WEB. All drivers recommended were already installed except OSL03071b2.usb. Have downloaded that file but don't know what directory to copy it into. From google searches, recommended directories don't exist on my system- uname -a
Linux ubuntustudio 3.2.0-23-lowlatency #31-Ubuntu SMP PREEMPT Wed Apr 11 02:30:51 UTC 2012 i686 i686 i386 GNU/Linux. I am somewhat knew to ubuntu so any basic help will be appreciated. My system will print and scan when connected to a borrowed HP Photosmart Prem C410 series. If the above OSL file is needed, where should I put it? "Lexmark" file search:
 /etc/cups/ppd/Lexmark-Lexmark-X73.ppd
/etc/sane.d/lexmark.conf
/usr/lib/i386-linux-gnu/gutenprint/5.2/modules/print-lexmark.la
/usr/lib/i386-linux-gnu/gutenprint/5.2/modules/print-lexmark.so
/usr/lib/i386-linux-gnu/sane/libsane-lexmark.la
/usr/lib/i386-linux-gnu/sane/libsane-lexmark.so.1
/usr/lib/i386-linux-gnu/sane/libsane-lexmark.so.1.0.22
/usr/share/cups/model/lz11-ppd/Lexmark-Z11-lz11-V2.ppd
/usr/share/man/man5/sane-lexmark.5.gz
/var/cache/cups/Lexmark-Lexmark-X73.data
/var/cache/samba/printing/Lexmark-X73.tdb

Tks in advance for any help.