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After restarting Ubuntu Server 20.04.2, use the wrong IP address. It is registered to DHCP for a MAC address such as this '9f6e852400020000ab117b61e29f5a2058bf'. When I run the command:

sudo dhclient -v -r ens160 && sudo dhclient -v ens160

the server obtains the correct registered IP address. The Server runs on VMware and the network uses only IPv4.

Does anyone know why this is happening and is there a solution to this?

Edit 19.9.2021: Problem isnt solved but I have "solution":

  1. install ifupdown

sudo apt install -y ifupdown

  1. edit /etc/network/interfaces

sudo nano /etc/network/interfaces

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp
post-up dhclient -r && dhclient

  1. purge netplan

sudo apt purge -y netplan.io

  1. use

sudo ifup -a
sudo dhclient -r

  1. restart network service or reboot

  2. delete netplan directory with config files

sudo rm -vfr /usr/share/netplan /etc/netplan

Maybe before point 4. restart network.

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  • Can you show us your network configuration file(s)? Mar 16, 2021 at 11:54
  • I hope, that this is what you want: 'network: ethernets: ens160: dhcp4: true version: 2' Mar 16, 2021 at 12:56
  • So you have removed Netplan, and opts for a "non-standard" way (on Ubuntu). I don't think this is a good idea, and neither will it be easier to get support here. Just my thoughts. Mar 19, 2021 at 12:56
  • Also in my world, a MAC address has 12 digits, but I may be limited in my knowledge here. Mar 19, 2021 at 13:01
  • 2Artur: Yes I know, it is non-standard solution. On Ubuntu 16.4.x LTS the network work fine. On Ubuntu 18.4.x LTS (clear installation) network work with same problem, but, when I Ubuntu upgrade from 16.4.x LTS to 18.4.x LTS, network work fine. Yes I know, that the MAC address has only 12char, and it was surprising me, and i don't understand, why this is happening. Mar 26, 2021 at 13:32

1 Answer 1

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Problem solved.

I found solution, when i was reading this article

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