Thanks in advance for reading this question! I just installed Ubuntu Server (CLI only) 16.04.3 LTS on my Dell Inspiron with a Centrino 2. I have a wired connection to my router, but I can't ping it or any other device on the network, nor can I ping any Google server. Attempting to ping anything other than the loopback interface yields "Destination Host Unreachable." I think it's a problem with the way I've configured my interfaces, but I can't be sure. I have added the output of ip and my routing table below:
ip addr show enp9s0
2: enp9s0: <N0-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether <MAC address> brd ff:ff:ff:ff:ff:ff
inet 192.168.0.30/24 brd 192.168.0.255 scope global enp9s0
valid_lft forever preferred_lft forever
route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 enp9s0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 enp9s0
AFAIK, these are correct, right? But my experience with networking is pretty limited, so they could also be wrong in some way that I didn't anticipate. The interface enp9s0 is my wired Ethernet controller, and I have it configured to have a static IP. I have confirmed that there are no IP conflicts with other devices on the LAN. Just in case it might help, here is my /etc/network/interfaces
auto lo
iface lo inet loopback
auto enp9s0
iface enp9s0 inet static
address 192.168.0.30
gateway 192.168.0.1
netmask 255.255.255.0
broadcast 192.168.0.255
dns-nameservers 8.8.8.8 8.8.4.4
Thanks in advance for any help that you can provide!
edit 1:
This morning I checked the BIOS settings regarding both network interfaces. Just to be sure, I toggled them with a boot in between, and they had no effect. On a whim, I decided to boot into a live Ubuntu desktop, only to find that the wireless interface works exactly as it should, but the Ethernet interface still does not. I think that the problems with the wireless interface stem from not having the wpasupplicant package installed. Unfortunately, this package isn't preexisting on the Server distribution, and I can't install it without attempting some serious apt hackery. The Ethernet interface not working is a bit concerning, though...perhaps a driver issue? or an unseen hardware issue? No matter what I try, I can't seem to get the state UP.
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