Hopefully @anon42388993, @lah7, @DaveB, @wolfman, @stevecook172001 or many of the other learned members will have input for this - I'm relatively new to MATE and might have made incorrect conclusions.
I'm testing virtualization on UM 16 and decided to install Oracle's
Virtual Box using MATE's Software Boutique and received these two conflicting messages
I possibly closed the message box prematurely preventing the package from installing
So I went to Oracle's site, downloaded the package which produced this upon install
This is seemingly an obvious conflict to my previously observed behavior.
Installed just fine after closing the suggestion box.