Desktop Settings
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Right-click on the desktop and select Desktop Settings.
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Disable the Vertical scroll trap
In the Mouse Actions section, delete the Vertical-Scroll entry.
TODO for KDE
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Enable flow control (why?) Konsole: per-profile setting : Settings > Edit current profile > Advanced > Enable flow control using Ctrl+S, Ctrl+Q.
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Disable fast user switching (why?)
echo -e "\n[KDE Action Restrictions] [\$i]\naction/switch_user=false\naction/start_new_session=false" | sudo tee -a /usr/share/kubuntu-default-settings/kf5-settings/kdeglobalsNote
See also this forum post.