How to interface upping Ubuntu Linux

I need upping my network interface in Ubuntu. What command I need to type to bring back the network interface in Ubuntu?

Run

 sudo systemctl restart networking

Another option is to down and up as follows:

ifdown eth0

To turn on eth0 interface run:

ifup eth0

See
https://www.cyberciti.biz/faq/linux-restart-network-interface/

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