Download all files from http://gambas.sourceforge.net/,
http://gambas.sourceforge.net/download.html,
http://www.linex.org/sources/linex/debian/dists/cl/gambas/binary-i386/
to a temporary directory. e.g. /d/temp/gambasdl
Check the file /d/temp/gambasdl/Packages. See there is