Just FYI I can confirm the same behaviour/error on this box when trying to
set/change to another browser. As far as I can tell the syntax is right.
xdg-settings set default-web-browser qupzilla.desktop
Colin, can you check to see if Chromium installed another version of xdg-settings on your machine? Chrome installs a version - not sure if it's older, newer or
modified in some way. Also, not sure if it makes a difference one way or another. I wanted to test, but still waiting for the kde-unstable repo to become