Today’s daily ISO for Bionic Beaver 18.04 sees an experimental switch to the Breeze-Dark Plasma theme by default.
Users running 18.04 development version who have not deliberately opted to use Breeze/Breeze-Light in their systemsettings will also see the change after upgrading packages.
Users can easily revert back to the Breeze/Breeze-Light Plasma themes by changing this in systemsettings.
Feedback on this change will be very welcome:
Thank you to Michael Tunnell from TuxDigital.com for kindly suggesting this change.