Dear UP,

Sorry for the late reply. You certainly made the right move by going for an Ubuntu virtual machine. Looking at the error message you get, it seems like the system cannot find the nu_correct command. There may be two reasons for that. The most likely is that you installed only the "minctools" package. I realized that the installation section of the wiki was not explicit enough regarding the list of required minc packages, which goes beyond the core minc tools. I updated this section, you can have a look here :
http://www.nitrc.org/plugins/mwiki/index.php/niak:Installation#MINC_tools

If it is available for your version of ubuntu, just install the mincbundle package that includes every single minc package. The tutorial can be found here :
http://en.wikibooks.org/wiki/MINC/Tutorials/BinaryInstalls

The other possibility is that you installed all of the tools, but somehow there are not found by default of your system. That happens sometimes, even thought the mincbundle package would be supposed to take care of that for you. Here is a tutorial on how to change your .bashrc file to add the minc tools :
http://en.wikibooks.org/wiki/MINC/Tutorials/AddingPaths

When you're done with that, just go in the folder where you have a MINC volume and try in a bash :

nu_correct -distance 200 my_vol.mnc my_vol_nu.mnc

This should run a non-uniformity correction on my_vol.mnc and generate the results in my_vol_nu.mnc. If not then there is something wrong with the installation. In this case please post more details regarding the installation steps you followed. 

Good luck with getting the software to work. The MINC community is currently putting efforts into simplifying the installation documentation and procedure, but there is still much room for imporvement. Your feedback is very much appreciated. 

Regards,

Pierre Bellec