Network is not connected

Question

After updating some data my system is not shown the Wifi option any more and it does not detect the network if I insert the wired cable.

I already tried these attempts:

1. etc/NetworkManager/NetworkManager.cfg

   [main] plugins=ifupdown,keyfile dns=dnsmasq
   
   [ifupdown] managed=false
   

2. /etc/network/interfaces, comment out everything other than:

   auto lo iface lo inet loopback
   

3. I deleted a pid file from /var/run/dbus

Still I cant get the internet option. It's irritating me. Can anyone give me the solution for it?