Hello, Scott, thank you for the fast and helpful reaction!
I agree I was suffering a xdg-open misconfiguration issue. Here's what I did to verify: $ grep xdg-open $HOME/.arduino/preferences.txt launcher=xdg-open Next, I then tried $ xdg-open file:///usr/share/arduino/reference/index.html Unsurprisingly, this worked. I then removed my bloody hack, and the same did no longer work, instead it came up with the same popup I had seen originally when I posted the bug. Regards, and thank you for providing fine software and user support, Andreas -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org