Recently I was unable to open Settings in Ubuntu 19.10
I tried to reinstall gnome-control-center, but didn't work.
I cannot open system settings in ubuntu 17.10
It doesnt open the Users Settings, System Settings
Cannot open gnome-control-center in ubuntu 17.04
This is the output in terminal
When running in superuser
# gnome-control-center
Bail out! ERROR:../shell/cc-shell-model.c:458:cc_shell_model_set_panel_visibility: assertion failed: (valid)
When running in normal user
$ gnome-control-center
/sys/firmware/dmi/tables/smbios_entry_point: Permission denied
/dev/mem: Permission denied
Segmentation fault (core dumped)
EDIT: Working Solution - Settings not opening on Ubuntu 19.10