Hello. As the title says, when you open MyPaint’s entry in Ubuntu Software, the “Website” button open a link to “http://mypaint.intilinux.com/” which redirects to some “AdBlocker” fake add-on page.
It seems to have stopped redirecting now but anyway, that’s not the right page after all.
Afaik, that homepage hasn’t been used in quite a while. I’m not sure who maintaines these packages, but according to the ubuntu package, which seems to be just a copy of debian’s package, @achadwick is one of them. There, mypaint.info is listed as the homepage which seems wrong too. That should probably be updated to the actual current homepage mypaint.org. Anyway, thanks for the info