I have a problem with my laptop, because everytime I want to connect to any local network via Ethernet cable or Wifi, then it doesn't assign any Ipv4, so that there is no possibility to have an internet connection. I need to plug reconnect to the internet + use the command below:
dhclient -i wlp3s0 -4
where wlp3s0 is the name of my interface. After shooting it couple of times, it works normally untill I restart my computer. OS is Ubuntu 16.04 and I don't use any VPN connection.
cat /etc/network/interfaces output:
interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback