Solved Playing with Libertine
EDIT: Please tell me this is the right place or did this belong in support?
Now that I am using UT on the OPO I decided to try to download the Brave browser and run it in a Xenial container.
So I got the Libertine container. Could not find any Brave debs, so I searched the webs and found a development .deb from January. Late enough, so I started the process of adding it in the Libertine container.
Looks like it's fine, but there is no way to access it. I tried to check if it was in the Libertine apps, and it seems to be there, says "Installed." Try to check in Terminal and... only Xenial is listed as an app.
I'm new to Libertine, so I may just be doing it wrong, but maybe I am searching in the wrong place?
I don't think there is an armhf 16.04 compatible deb for Brave - support starts at 18.04 to the best of my knowledge, and I am not sure whether even that includes armhf.
Worked on testing Firefox. Marking solved.