Does Mate automaticly run uppdate as a super user? Not asking for permissions at all.
One other thing of note. The super user account is labeled linux 17.3 Rosa is that not from cinnamon?
Let's start with: I thought you were running Cinnamon?
Yes, if you are indeed using the LiveMateUSB you can Update as super user because it has not been installed, so there is no password yet, at least for Updates.
There is a login password, "mint" I think but that's it as far as I remember.
Just remember not to "Upgrade" as the USB won't have room for all those Upgrades. And don't run the Driver Manager either, like you did with your last Cinnamon install, it will most likely get stuck in a endless loop.
Don't understand the second sentence either? Are you running from the LiveMateUSB? If so, then it has nothing to do with Cinnamon, you are running off the USB, independent of your Cinnamon Install...Completely.
Hope that helps!