Netplan
Articles covering Netplan.
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Configure Ubuntu 26.04 Networking: Static IP, nmtui and Two NICs
Choose the active network manager, configure a static address and handle routing and DNS when Ubuntu 26.04 has two interfaces.
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Set a Static IP on Ubuntu 24.04 with Netplan, DNS and SSH Recovery
Inspect Netplan files and the active renderer, set an address and DNS, and test the change with a recovery path available.