Ubuntu Linux Restart Network Service

I am a new Ubuntu Linux user and using it on my HP Laptop. Now, I need to restart my network service. How do I restart network under Ubuntu Linux? How can I restart networking service on Ubuntu LTS server? How do I successfully restart a network service without rebooting Ubuntu box?

Tutorial details
Difficulty	Easy (rss)
Root privileges	Yes
Requirements	None
Time	1m

Ubuntu Linux comes with a script called networking (Ubuntu restart network command). This script is used to activates or deactivates or restart all network interfaces (NIC) configured to start at boot time.

Ubuntu Linux restart network command

Open shell or terminal and type the command as follows:
$ sudo /etc/init.d/networking restart
You can also use the following command:
$ sudo service networking restart
Sample outputs:

 * Running /etc/init.d/networking restart is deprecated because it may not enable again some interfaces
 * Reconfiguring network interfaces...                                           * Disconnecting iSCSI targets
   ...done.
 * Stopping iSCSI initiator service
   ...done.
resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing anything.
 * Disconnecting iSCSI targets
   ...done.
 * Stopping iSCSI initiator service
   ...done.
resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing anything.
resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing anything.
 * Starting iSCSI initiator service iscsid
   ...done.
 * Setting up iSCSI targets
   ...done.
ssh stop/waiting
ssh start/running, process 45886
resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing anything.
 * Setting up iSCSI targets
   ...done.
ssh stop/waiting
ssh start/running, process 45946

You can use this command on remote Ubuntu Linux server without any problem, but make sure you pass only restart option. This command also accepts start and stop options:

The start and stop option

To start or stop service:
$ sudo /etc/init.d/networking start
$ sudo /etc/init.d/networking stop

Category	List of Unix and Linux commands
File Management	cat
Firewall	Alpine Awall • CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04
Network Utilities	dig • host • ip • nmap
OpenVPN	CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04
Package Manager	apk • apt
Processes Management	bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time
Searching	grep • whereis • which
User Information	groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w
WireGuard VPN	Alpine • CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04