In the interest of increasing security of my pi I followed the Secure Raspberry Pi Guide
After doing so and deleting old pi user and rebooting I now cannot authenticate sudo from the GUI. For new software installation for example.
My new user does not appear in the drop down box: only root and pi.
I want to add my new user and delete pi from the GUI authetication boxes.
I can still mount LUKS drives etc from command line so all is working - but use of the GUI is sometimes easier.
Using Full Raspbian Pi Desktop from January 2020. So up to date.
It said some usability can be lost on deleting default pi - but the aim was to reduce this in later version of pi desktop.