Thread:Project:Support desk/Scribunto / Lua error: Cannot create process./reply (8)

The error message was giving you a clue. It says "...lua5_1_5_linux_32_generic: is a directory" and "...lua5_1_5_linux_32_generic: cannot execute".

This indicates that it is trying to execute the bit in 'luaPath'. So the bit I gave you wasn't quite right. Change it to