Binary package “postgresql-pltcl-10” in ubuntu bionic

PL/Tcl procedural language for PostgreSQL 10

 PL/Tcl enables an SQL developer to write procedural language functions
 for PostgreSQL 10 in Tcl. You need this package if you have any
 PostgreSQL 10 functions that use the languages pltcl or pltclu.
 .
 PostgreSQL is an object-relational SQL database management system.