lua5.1 binary package in Ubuntu Lunar riscv64

 Lua is a powerful, light-weight programming language designed for extending
 applications. The language engine is accessible as a library, having a C
 API which allows the application to exchange data with Lua programs and also
 to extend Lua with C functions. Lua is also used as a general-purpose,
 stand-alone language through the simple command line interpreter provided.
 .
 This package contains the Lua command line interpreter and bytecode compiler.
 Install it if you are developing or using Lua scripts.

Source package