Yes, I’m on Lumina and I haven’t change wallpaper or anything. I tried to change the colour scheme, but it didn’t work well, so I set it back to default.
I did however install KDE-baseapps, but it didn’t change anything according to the icons. They came back directly after the install, but disappeared again when I rebooted. Actually, I just logged out and logged in again as a test, but that made the icons disappear anyway.
@Sergio had an interesting point. But is there a way around that?
Another thing. This laptop now also has the same issue as my own and won’t turn off normally. When I try to turn it off from the menu, it goes to the login screen. From there I can turn it off from the small menu at the lower right. But in this case it’s easier just hitting the power button, then I get a normal power off.
When I rolled back to 17-something (the DE before 17.12 - please note, I’m now talking about my own laptop and that has all icons) the power off and all system sounds worked. But now after I upgraded to 18.03 the roll back doesn’t work good anymore. It rolls back, but I only get the wallpaper, no main menu, no icons, no nothing.
I just hope all this with power off, system- and warning sounds and mic settings (that also not working on my laptop) will be fixed on Lumina 2.0 that if I’ve understood it correctly will come with the next STABLE upgrade in June if it’s not overdue.