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I am assigning a static IP 4 address to ens33 interface on Ubuntu 24.04 using nmcli. But I'm getting the error.

Error. unknown connection 'ens33'

The commmand I am exceuting on terminal:

sudo nmcli connection modify 'ens33' ipv4.address 172.16.1.2/16

You can see from the attached image, ens33 interface exists.

enter image description here

Note: If assign this IP address to 'lo' interface, it works.

I am following this guide: https://greenwebpage.com/community/how-to-change-an-ip-address-on-debian-12/

What could be wrong? Your help is appreciated.

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Yes, the ens33 interface exists, but the command isn't asking you for an interface name. It is asking you for a NetworkManager connection profile name. In your screenshot, the network profile active on ens33 is named netplan-ens33.

There is no 1:1 relationship, as NM allows you to have many profiles that could be activated on a given interface (consider e.g. a laptop with a single 'wlan0' interface and 20 different Wi-Fi network profiles). This also means that you have to reapply the profile after editing, using nmcli con up <name>.

However, the profile name suggests that the profile has been automatically generated by Netplan, in which case you shouldn't be editing it directly through NM as it will be re-generated anew upon the next reboot. Instead you should edit the files in /etc/netplan and run netplan apply.

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