Using raspbian (4.4.13+) I created a new user to replace the default "pi". It belongs to the same groups that pi is (adm, dialout, cdrom, sudo, audio, video, plugdev, games, input, netdev, gpio, i2c and spi).
The new user work correctly and using "sudo" it can do everything.
BUT if I would like to perform an action with raised privileges from GUI (example: add/remove software) the only prompted allowed identities are "root" and "pi". No way to select a different one.
Obviously I miss something, but I don't know where to look.
Thanks in advances.