As lubuntu does not run a composite manager by default with a transparent panel the desktop background showing through on the panel is the expected behavior. If you want compositing in lubuntu you could install a composite manager like compton for transparency but this would make lubuntu heavier which is why it is not included by default.
** Changed in: lxpanel (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1288308 Title: wrong background image To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lxpanel/+bug/1288308/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs