When I first heard of mintInstall, I was very excited to see the outcome.
I'm sorry to say it is not what I expected.
It seems like you were on to something great, then hit a wrong turn and got off the right track.
Package Names are the big bad wolf here. What ever happed to traditional nice and friendly names instead of "libffmpegthumbnailer4".
I compared mintInstall to the Ubuntu Software Center, and it just didn't match.
Try to get things a bit more organized, and you should have a nice little brilliant piece of software to play with.
Thanks for reading,