Install Debian over Ubuntu using same home partition

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http://unix.stackexchange.com – I'm interested in changing from Ubuntu to Debian. I currently have 12.04LTS installed on its own boot partition which is separate from the /home partition. I would simply wipe the Ubuntu partition and install Debian and modify the fstab file to mount my home and swap partitions. What types of problems would I come across? Which would be a better choice the testing or unstable branch? (HowTos)