Hi Marijke,
Are you using the Neurodebian packages or the Official Ubuntu ones?
In the official Ubuntu package repository website, it is said no available package for fsl-possum-data
http://packages.ubuntu.com/karmic/science/fsl
Could you the Neurodebian repository? I had no problems installing fsl-possum-data package from it.
http://neuro.debian.net/index.html#how-to-use-this-repository
Cheers,
Alex
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