Suggestion: Use MATE applications in the eventual Unity 7 flavor of Ubuntu 18.04

I see you built an image with caja instead of nautilus. I quickly tested it in live mode, and here’s what I’ve found:

  • Trash button on Unity’s dash doesn’t seem to work;
  • Unity’s dash color doesn’t adapt to caja’s desktop background;
  • Unity’s display properties does’t show the correct desktop background.
  • Caja isn’t pinned to Unity’s dash by default on the image you built (even though it seems to behave correct if I do pin it, even though it doesn’t have the expected shortcuts when you right click on it in the dash);
  • Killing caja on the terminal and execute caja --force-desktop means caja won’t integrate with global menu anymore. However, I didn’t test if caja --force-desktop --no-default-window would work as intended though.
  • Right-clicking on the desktop and select to change background doesn’t seem to work, which means mate-appearance-properties isn’t installed, as @Wimpress explained before.

I think all this stuff is kinda expected at this point, but I felt I should point it out, since it stands out almost immediately.