FYI, I made this work in Linux Mint 18 KDE by replacing the following line in /usr/bin/xdg-mime
1000 # KTRADER=`which ktraderclient${KDE_SESSION_VERSION} 2> /dev/null` 1001 KTRADER=`which ktraderclient 2> /dev/null` It likely has to do with Plasma 5 and some greps. $ ktraderclient5 -v ktraderclient 5.6.5 $ ktraderclient -v Qt: 4.8.7 KDE Development Platform: 4.14.16 KTraderClient: 0.0 Chromimum was able to set itself default after the change, and wont complain any more. I see open Bug ref. with xdg-utils: https://bugs.freedesktop.org/show_bug.cgi?id=98562 (hopefully they'll fix this for good some time) ** Bug watch added: freedesktop.org Bugzilla #98562 https://bugs.freedesktop.org/show_bug.cgi?id=98562 -- You received this bug notification because you are a member of UBUNTU - AL - BR, which is subscribed to Chromium Browser. https://bugs.launchpad.net/bugs/1509139 Title: Shows "Chromium isn't your default browser" since 15.10. Status in Chromium Browser: New Status in chromium-browser package in Ubuntu: In Progress Status in google-chrome package in Ubuntu: Confirmed Status in google-chrome-beta package in Ubuntu: Confirmed Status in xdg-utils package in Ubuntu: Confirmed Bug description: Since the 15.10. upgrade Chromium shows on every launch "Chromium isn't your default browser", even when i select "Set as default" or "Don't ask again". Chromium is set as default application for "Web" at System Settings -> Details -> Default Applications. Version 45.0.2454.101 Ubuntu 15.10 (64-bit) To manage notifications about this bug go to: https://bugs.launchpad.net/chromium-browser/+bug/1509139/+subscriptions -- Mailing list: https://launchpad.net/~linux-traipu Post to : linux-traipu@lists.launchpad.net Unsubscribe : https://launchpad.net/~linux-traipu More help : https://help.launchpad.net/ListHelp