What exactly fails (what step) and what were your choices there? I'm not familiar with Mint setup itself, but looking at the documentation, there should be "Installation Type" screen where you can choose default dual boot option, or even manual partitioning.
https://sites.google.com/site/mintwiki/main#TOC-Dual-boot
For some deeper Mint specifics, you might want to refer to their forum: http://forums.linuxmint.com
It's good to hang around there in general, if you plan to use Mint distribution.
https://sites.google.com/site/mintwiki/main#TOC-Dual-boot
For some deeper Mint specifics, you might want to refer to their forum: http://forums.linuxmint.com
It's good to hang around there in general, if you plan to use Mint distribution.


