Note that if your Kubuntu install is a VirtualBox guest you need to start it with a normal start if you want the shared clipboard to work. If you start headless or detachable the shared clipboard will not work (in my experience).
If your Kubuntu install is not a VirtualBox guest you can skip the virtualbox-guest-* package installation above.
So I’m still used to pressing WinKey+R (AKA Meta+R) to bring up a command prompt. I added the Search and Launch widget to my default panel in KDE Plasma, then right-clicked on it and selected “Search Settings…”. From there I could bind an appropriate keyboard shortcut.
Every now and again I will accidentally click the middle mouse button when I go to grab my mouse, and KDE will dump my clipboard buffer into a BASH shell. Not good. Could run something damaging if I’m unlucky. So see here for the solution. Basically run this to get the mouse device ID:
xinput list | grep 'id='
Then to edit e.g. device 10 to disable middle mouse button:
xinput set-button-map 10 1 0 3
To persist the changes add the set-button-map command to e.g. ~/.xstartup.
Or you can add a pointer configuration to ~/.Xmodmap like this:
pointer = 1 0 3 4 5 6 7 8 9 10
And make sure xmodmap is applied at start-up with an autostart file like e.g. ~/.config/autostart/mouse-config.desktop:
I managed to get my desktop settings so that files on the desktop were sorted automatically. But I didn’t want that. I edited the ~/.kde/share/config/plasma-desktop-appletsrc file and set the sortingStrategy=0 and that disabled automatic alphabetical desktop sorting.
I wanted to run an application on my desktop when I dropped some files on it. To do that I created a process.desktop file like this: