/etc/sudoers shows no privileges, yet `sudo –list` reports ALL privileges

tl;dr /etc/sudoers and groups implies no sudo privileges. Yet sudo –list reports ALL sudo privileges. Why the difference? Background On an Ubuntu 18 desktop, file /etc/sudoers has Defaults !visiblepw Defaults always_set_home Defaults secure_path=”/sbin:/bin:/usr/sbin:/usr/bin” Defaults env_reset Defaults env_keep=”COLORS DISPLAY HOSTNAME HISTSIZE INPUTRC KDEDIR LS_COLORS” Defaults env_keep+=”MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE” Defaults env_keep+=”LC_COLLATE LC_IDENTIFICATION…

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