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 Sof…

@stevecook172001 is right, this error is caused by the Boutique's repository information about VirtualBox. A new 2016 signing key is needed: [image] VirtualBox from Software Boutique Untrusted source error Support & Help Requests Looks like the new 2016 key is not present…