To make your life easier, Debian packages are now available for the LatticeMico32 GCC toolchain used for building Milkymist software and for flterm, the RS232 software upload program.
Add this line to your /etc/apt/sources.list:
deb http://www.milkymist.org/debian/ ./
and install with:
apt-get install gcc-lm32 flterm
Those packages work under Debian Testing and might also be compatible with Ubuntu. Anyone tested?