New answers tagged background
Apologies, that did not work after all. The following worked: sudo gedit goto /usr/share/themes/Greybird/gtk-2.0/gtkrc change from: gtk-color-scheme = "bg_color:#CECECE\nselected_bg_color:#398ee7\nbase_color:#fcfcfc" # Background, base. gtk-color-scheme = "fg_color:#3C3C3C\nselected_fg_color:#000000\ntext_color:#212121" # Foreground, text. ...
In Ubuntu Studio I found that this problem can be solved by selecting a different Style in Windows Manager, e.g. from MurrinaDark to MurrinaBlue.
Apparently, I found the problem. In the folder ~/.kde/share/config/ there is a file called kwinrulesrc that needs to be removed. Just in case rename it and see if that fixes the problem. If so, it is safe to delete it.
I found out an answer myself. A solution is to install 3rd party themes like Numix, Paper, etc... It fixed almost entirely this issue.
As @christian anwser you can use this command gsettings set org.gnome.desktop.background show-desktop-icons true
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