Sorry for (ab)using the forum for topics that perhaps should be communicated other way

A friend of us, Joe, tried to install Ubuntu 9.10 on his eCS machine. He was unable to boot Ubuntu using BM after installation. He got "disk not formatted" error. eCS booted, LVM reported no errors on the disk, the Ubuntu partition was okay. We suspected ext4, but it wasn't guilty - installing Ubuntu on ext3 did not solved the problem.
In the end, the only thing that could cause troubles, was GRUB 2. Ubuntu 9.10 uses GRUB 2 while preceding versions use GRUB 0.9. Therefore, Joe installed Ubuntu 9.04 and the upgraded to 9.10. This passed.
This means that GRUB 2 seems to be incompatible with BM somehow. Because GRUB 2 can be supposed to appear in further releases of other Linux flavours, too, this could mean that eCS/Linux machines won't be booted using BM.
The whole discussion is on os2.cz . Can anybody inform eCS maintainers about possible problems with BM?