Most likely is that you had a version of hugin that was either 
downloaded directly or from a PPA that was no longer available to the 
system.  When you went to upgrade luminance it needed up upgrade a 
library that hugin was also using but was incompatible so it required 
you to uninstall hugin to continue.
Then then you installed hugin again it pulled a different version from 
what was previously installed from your repositories and it's 
dependencies were already aligned with the requirements of luminance, so 
now everything works.

Brian Cluff

On 06/27/2016 07:54 AM, Michael wrote:
> It is strange luminance and hugin are both installed. Now luminance 
> was not working so I reinstalled it with apt and then apt informed me 
> that it needed to uninstall hugin. I let it do it and after I was done 
> with what I had to do I reinstalled hugin. now both work as they had 
> before. Why is this? I figure it is the order in which the programs 
> were installed.
>
> -- 
> :-)~MIKE~(-:
>
>
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