I managed to replace Lub. 18.04 by 20.04 with preservation of all custom menus and keyboard shortcuts. It all works fine except one minor problem. In LXDE, there was a panel widget showing the desktop number. Such widget is absent in LXQt. I do not use the desktop switcher (it is removed from the panel; I rely on keyboard shortcuts), so not seeing the desktop number is annoying. There are obvious workarounds like jumping one desktop back and forth, but I would rather see the desktop number shown. Any suggestions?