please check /etc/dbus-1/system.d/nm-dhcp-client.conf ... if there is user="dhcp" then you modified that file manually once. change that to "root" ... or --purge network-manager and install again.
please check /etc/dbus- 1/system. d/nm-dhcp- client. conf ... if there is user="dhcp" then you modified that file manually once. change that to "root" ... or --purge network-manager and install again.