Ubuntu – Fresh Install of Ubuntu Server 19.04 Has No Internet

19.04internetnetworkingserver

I just finished installing the new Ubuntu 19.04 Server on my downstairs server, but it doesn't appear to have an internet connection despite being wired to the router using a cat-6 cable.

All pings fail, including ping 8.8.8.8 with the same error message. I've tried using ifconfig to set the state to up, but this didn't help.

ip a reveals that the server doesn't seem to have an IP address.

Pictures below:

Best Answer

To obtain IP address from DHCP server manually you can run

sudo dhclient enp0s25

To make this solution permanent you should use the corresponding configuration file inside 19.04 for Netplan (see server guide, p. 43) - /etc/netplan/01-netcfg.yaml with the following contents:

network:
  version: 2
  renderer: networkd
  ethernets:
    enp0s25:
      dhcp4: yes

then apply the configuration with sudo netplan apply.

The file contents of /etc/netplan/01-netcfg.yaml above is modified variant of /usr/share/doc/netplan/examples/dhcp.yaml configuration file.
More examples of Netplan configuration are shown in /usr/share/doc/netplan/examples/.

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You shouldn't have messed with the pre-existing lo (loopback) interface: you need to revert that to

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

and then add your external static interface, for example

auto em1
iface em1 inet static
address 192.168.1.120
netmask 255.255.255.0
network 192.168.1.0
gateway 192.168.1.1

(these are not necessarily correct for your network: you will need to verify). You will also likely need to add at least one DNS nameserver e.g. to use Google's public DNS servers

dns-nameservers 8.8.8.8  8.8.4.4

Alternatively, if your router supports DHCP address reservation you might want to use that instead - it's arguably simpler, especially for home networks.

Ubuntu – Ubuntu desktop GNOME “no Internet connection” on 19.04

If you wish for Network Manager to control networking, rather than netplan, remove the existing netplan file:

sudo rm /etc/netplan/*.yaml

Create a new file:

sudo nano /etc/netplan/01-network-manager-all.yaml

Add the following:

# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager

Netplan is very specific about spacing, indentation, etc. Please proofread carefully twice. Save and exit nano.

After making these changes, do:

sudo netplan generate
sudo netplan apply

then

sudo service network-manager restart

sudo systemctl restart network-manager

It may ultimately take a reboot.

Best Answer

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