I've seen some people saying the file to set static ip is still /etc/network/interfacesAnd I've seen other people saying that in 18.04 it's now on /etc/netplan (which people seem unhappy about)I've tried putting this: version: 2renderer: networkdethernets:eth0:dhcp4: nodhcp6: noaddresses: 192.168.1.9/24gateway4: 192.168.1.1nameservers:addresses: 192.168.1.1, 8.8.8.8, 8.8.4.4In my /etc/netplan/50-cloud-init.yaml and doing sudo netplan apply but that just kills the servers connection to the internet. Ubuntu 18.04 uses now Netplan to configure the network interfaces, so the configuration must be done in the file /etc/netplan/50-cloud-init.yaml, the documentation advises not to mess anymore with the old file /etc/network/interfaces. I have used this configuration with my Ubuntu Server virtual machine and it works so far, just make sure the info is correct; the optional: true setting supposedly speeds up the booting time by not verifying if the interface is connected or not, this is default, also there is no need to declare values not used, for example DHCP, if they are absent they are taken as disabled, also the default renderer in Ubuntu Server is networkd so there is no need to declare it. Taking the information from your post, it should be like this: network:ethernets:eht0:addresses:- 192.168.1.9/24gateway4: 192.168.1.1nameservers:addresses: 192.168.1.1, 8.8.8.8, 8.8.4.4optional: trueversion: 2Once you save the file, run sudo netplan -debug apply the debug flag will output more info and can help to detect any errors. Check the ethernet cable, if in virtual review the VM configuration.
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If using a WLAN I have read that it is a bit more tricky to setup but I haven't yet set up a machine connected to WiFi with this server version.If you want more info about Netplan there is a website, it has some basic configuration examples. Network configuration in 18.04 is managed via netplan and configured with cloud-init.To change your network configuration edit the 50-curtin-networking.cfg file in /etc/cloud/cloud.cfg.d/. If this file does not exist then create it.Find your interface name ip address showEdit / create the cloud-init network configuration file sudo nano /etc/cloud/cloud.cfg.d/50-curtin-networking.cfgTo set a static IP address, use the addresses key, which takes a list of (IPv4 or IPv6), addresses along with the subnet prefix length (e.g. Gateway and DNS information can be provided as well: network:version: 2ethernets:eth0:addresses:- 192.168.1.9/24gateway4: 192.168.1.1nameservers:addresses: 192.168.1.1, 8.8.8.8, 8.8.4.4You can find more configuration options atReload the cloud-init configuration. This will reboot your server. Sudo cloud-init clean -r.