I'll recheck bugs from my previous post.
Tried Ubuntu MATE 19.04 beta on VirtualBox 5.1.
Very good overall. Looks nice and traditional 
Minimal install problems:
- It is strange that Minimal installation adds LibreOffice icon to the menu, but it does not function. It also does not start from terminal. I reported this previosly to launchpad as bug 1813538 .
- MATE Welcome → Getting Started → Optional tasks: unable to install Deja Dup - reported this previously as bug 1813549 .
Full and minimal install problems:
- MATE Welcome → Software: boutique does not show applications with “Sorry, Welcome could not feature any software fot this category that is compatible on this system.” message. But it is expected, as 19.04 is not released yet.
- MATE Welcome → Getting Started → Updates & Extras: it is impossible to install Blu-Ray and DVD Playback Support - shows errors about Release file on VLC's site: it "is not signed". Maybe temporarily issue.
- MATE Welcome → Getting Started → Drivers, Printers: HPLIP is listed here, but does not show its menu in tray (reported previously as bug 1810745 ).
- MATE Welcome → Browser Selection: the Brave Browser does not install, but it is expected.
- As before keyboard LED indicator have low contrast on light themes.
- As before Caja does not show previews of text files on Bionic and newer versions.
- As before Human, Human-Clearlooks and other themes have incorrect gray window title color .