try this:
sudo dpkg -r gtk2-engines-pixbuf
If this package is required by oxygen-molecule (as in my situation), remove it
if it's unnecessary:
sudo apt-get remove oxygen-molecule
And then remove gtk2-engines-pixbuf
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Desktop
Maybe rename KDE System Settings to Kontrol Center?
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Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/735166
Title:
Duplicate System Settings & System Monitor in Gnome/U
