No internet connection after ubuntu server 20.04 install, ifconfig not available

Question

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.

Also ip link. Look at service NetworkManager status, to. The whole ifconfig/ifup/ifdown system is depreciated in later Ubuntu releases. — waltinator, May 01 '20 at 13:35
@waltinator Network Manager is not installed by default in Ubuntu server. — chili555, May 01 '20 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 01 '20 at 14:02
Along with @chili555 request, also please show us sudo lshw -C network and cat /etc/network/interfaces. — heynnema, May 01 '20 at 14:35

score 13 · Accepted Answer · answered May 01 '20 at 15:55

13

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.

answered May 01 '20 at 15:55

chili555

60,188

Good job! +1... however, be careful with your mv, as there may be more than one .yaml file in /etc/netplan. – heynnema May 01 '20 at 16:08
worked. Thank you :) – wardaddy May 01 '20 at 16:23
@heynnema Let's discuss, please: https://chat.stackexchange.com/rooms/107486/heynnema-and-chili555-discuss-netplan – chili555 May 01 '20 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 04 '20 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 03 '21 at 01:04

score 2 · Answer 2 · answered Jul 21 '20 at 14:42

2

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.

answered Jul 21 '20 at 14:42

Heigre

21

You can find out the name of your network interface name using ifconfig – RyanQuey Oct 19 '20 at 22:41
2

@RyanQuey As per question statement (and I can confirm) ifconfig is not installed, and it cannot be without network. – tishma Dec 17 '20 at 11:35
@RyanQuey You have to have it installed first. Can't install if you have no network! – DevOpsSauce Nov 22 '21 at 15:19
Since ifconfig is not available you can also use the command ip link – Gibado Aug 26 '22 at 17:23

No internet connection after ubuntu server 20.04 install, ifconfig not available

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