Just saw an article, it is quite complicated, I feel that it is quite simple. When I have played the system, I have done it. Now it is system, but there is no such need :)
I am so dry at the time:
Single one partition is made / boot This is two distro / boot
When you install the second disgu, you also choose this / boot but does not format this partition so that you will not kill the first Distro boot file.
At this time, modify the boot program, add the first distribution boot method to the second Distro boot program configuration.
Load the boot process, complete
Note: Which distribution procedure is emphasized, because it is LILO, the configuration file is in a certain distribut, but also can be installed in a disrto, if it is GRUB, even if it is Guide procedure, basically there is no difference
Note 2: This method guides different DISTRO's largest differences in kernel parameters root = selected root partition
