Thanks for replying helpfully Nimbus2000 !! As it happens I did try ZOS just for fun on my 'play box' recently. It does have some cute features, but IMO=> It was (as a whole) buggy, disappointing & not nearly as mature as Ubuntu Mate, which is my distro of choice. Years ago I'd used the paid Zorin version of Ubuntu 11.04 for a client's PC as he was elderly & undemanding. Later, I upgraded his PC to Ubuntu Mate & he had an even better time using that. One must take into account that ZOS is really ONLY supported by a smallish number of users - with a tiny group of paying users getting 'premium' support from the Zorin brothers. That may make for a tidy income for those young guys - but it doesn't make for a well supported Ubuntu variant from this (former) user's POV. From my POV there is no sufficiently good reason to switch to ZOS; Instead of needing to change distros, there should be more attention given to the need for better Android connectivity in the much larger Ubuntu community. Ubuntu 20.04 supposedly covers this need a bit better than 18.04 did - but that release is still too messed up for my preferences.