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I recently installed Ubuntu Server 20.04 LTS on my desktop, and found out there was no internet connection even though I had the LAN cable connected. ifconfig and iwconfig failed saying the corresponding packages net-tools and wireless-tools were not installed.

EDIT

Here is the info requested. Please find the image here.

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6
  • Add to your question above the complete output of ip addr
    – user535733
    May 1, 2020 at 13:31
  • Also ip link. Look at service NetworkManager status, to. The whole ifconfig/ifup/ifdown system is depreciated in later Ubuntu releases.
    – waltinator
    May 1, 2020 at 13:35
  • @waltinator Network Manager is not installed by default in Ubuntu server.
    – chili555
    May 1, 2020 at 13:58
  • Please edit your question to show the result of the terminal command: cat /etc/netplan/*.yaml Welcome to Ask Ubuntu.
    – chili555
    May 1, 2020 at 14:02
  • Along with @chili555 request, also please show us sudo lshw -C network and cat /etc/network/interfaces.
    – heynnema
    May 1, 2020 at 14:35

2 Answers 2

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Networking in Ubuntu server is managed by netplan. Your file lacks the details needed to connect the ethernet properly.

First, let's rename the file:

sudo mv /etc/netplan/*.yaml  /etc/netplan/01-netcfg.yaml

Now, let's change it to include the required details:

sudo nano /etc/netplan/01-netcfg.yaml

Change the file to read:

network:
  version: 2
  renderer: networkd
  ethernets:
    ens33:
      dhcp4: true

Netplan is very particular about spacing, indentation, etc. Proofread carefully twice. Save (Ctrl+o followed by Enter) and exit (Ctrl+x) the text editor. Follow with:

sudo netplan generate
sudo netplan apply

You should be all set.

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  • Good job! +1... however, be careful with your mv, as there may be more than one .yaml file in /etc/netplan.
    – heynnema
    May 1, 2020 at 16:08
  • worked. Thank you :)
    – wardaddy
    May 1, 2020 at 16:23
  • @heynnema Let's discuss, please: chat.stackexchange.com/rooms/107486/…
    – chili555
    May 1, 2020 at 22:56
  • solved my problem on ubuntu-desktop. but why netplan is not installed on ubuntu desktop already? I had to download .deb file. thank you
    – Mohammad Hossein
    Sep 4, 2020 at 20:17
  • I was hoping I would find an answer here, but alas, I didn't. My netplan config is there. Did 20+ servers all the same. This one, however, no dice. Fresh server out of the box too. Log during install says it can't resolve archive.ubuntu.com to download packages.
    – DevOpsSauce
    Sep 3, 2021 at 1:04
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A short addon to chili555's answer: In my case, the only problem was that for some strange reason, Ubuntu believed my network interface name in /etc/netplan/01-netcfg.yaml to be enp0s5 instead of enp0s4 which was the correct for my VM.

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  • You can find out the name of your network interface name using ifconfig
    – RyanQuey
    Oct 19, 2020 at 22:41
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    @RyanQuey As per question statement (and I can confirm) ifconfig is not installed, and it cannot be without network.
    – tishma
    Dec 17, 2020 at 11:35
  • @RyanQuey You have to have it installed first. Can't install if you have no network!
    – DevOpsSauce
    Nov 22, 2021 at 15:19
  • Since ifconfig is not available you can also use the command ip link
    – Gibado
    Aug 26, 2022 at 17:23

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