WHO                          UID  USER PID  COMM            WHAT                                                     WHY                                                         MODE 
ModemManager                 0    root 1257 ModemManager    sleep                                                    ModemManager needs to reset devices                         delay
NetworkManager               0    root 1093 NetworkManager  sleep                                                    NetworkManager needs to turn off networks                   delay
UPower                       0    root 1399 upowerd         sleep                                                    Pause device polling                                        delay
Unattended Upgrades Shutdown 0    root 1300 unattended-upgr shutdown                                                 Stop ongoing upgrades or perform upgrades before shutdown   delay
GNOME Shell                  1000 imac 3080 gnome-shell     sleep                                                    GNOME needs to lock the screen                              delay
imac                         1000 imac 3221 gsd-power       handle-lid-switch                                        External monitor attached or configuration changed recently block
imac                         1000 imac 3215 gsd-media-keys  handle-power-key:handle-suspend-key:handle-hibernate-key GNOME handling keypresses                                   block
imac                         1000 imac 3215 gsd-media-keys  sleep                                                    GNOME handling keypresses                                   delay

8 inhibitors listed.