this seems to be an issue with your board, on the supported ubuntu architectures native installation of mono packages works fine (there are surely plenty issues with applications, but the breakage you describe above observed in VMs yet) all our images build fine and install the mono dependencies without problems on omap (lucid-natty), imx51(jaunty-lucid), dove (jaunty-maverick) and omap4 (maverick-natty) platforms.
this seems to be an issue with your board, on the supported ubuntu architectures native installation of mono packages works fine (there are surely plenty issues with applications, but the breakage you describe above observed in VMs yet) all our images build fine and install the mono dependencies without problems on omap (lucid-natty), imx51(jaunty- lucid), dove (jaunty-maverick) and omap4 (maverick-natty) platforms.