Installer fails when it can't mount one of existing partitions

[kuzelnik]

I was installing Mint Linux Katya RC to one of partitions I keep on disk for testing purposes.
The installer runs, copies files and then starts performing "data migration". I suppose it is trying to mount other partitions and load some data from previous installations of Linux or from Windows partition. (I really wish there was an option to skip this step. I do not think I want automatic data migration, I keep /home on separate partition for all my distributions.)
When the installer tries to mount one of my partitions (I guess it is FreeBSD partition) it fails with Error message "An error occurred during data migration". Previous message is my translation, I was trying to install in different language than English.