My ubuntu 15.10 server has lost internet inspite of connecting internet cable

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I have this file `/etc/network/interface`

#interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

auto eno1
iface eno1 inet manual


auto br0
iface br0 inet static
address 192.168.10.7
netmask 255.255.255.0
network 192.168.10.0
gateway 192.168.10.1
dns-nameservers 188.xxx.97.57 8.8.8.8
bridge_ports eno1
bridge_fd 9
bridge_hello 2
bridge_maxage 12
bridge_stp off

For some reason i can't connect to the internet even though the internet cable is plugged in and the computer is on.The server i am using is **hp proliant gen9 380**