No wallpaper and WiFi after recent update

[filo]

Wallpaper resetting to black color after reboot

The 'inactive blur' is broken with the Plasma 2.5 update. I am sure it will be update soon, but in the meantime, right-click on your desktop and hit 'configure desktop and wallpaper', then under 'Wallpaper Type' switch it to 'image.'

For the WiFi, this could be applicabile

Problem with Wifi

It seems to be a known regression: https://bugzilla.kernel.org/show_bug.cgi?id=215201 see latest comments. Once the restore aspect is fixed, you could try with the linux-lts kernel. The fix is available and should be included in kernel v5.18.6