libgutenprintui2-1 binary package in Ubuntu Bionic i386

 This package includes the libgutenprintui library, necessary to run
 gimp-gutenprint. libgutenprintui contains GTK+ widgets which may be
 used for print dialogs etc. for use with libgutenprint.
 .
 Gutenprint is the print facility for the GIMP, and in addition a
 suite of drivers that may be used with common UNIX spooling systems
 using GhostScript or CUPS. These drivers provide printing quality
 for UNIX/Linux on a par with proprietary vendor-supplied drivers in
 many cases, and can be used for many of the most demanding printing
 tasks. Gutenprint was formerly known as Gimp-Print.

Source package