Upgrading Ubuntu 20.x -> 22.x killed my network

I’ve spent the last several hours trying to figure out what’s going on, but I’m totally stuck.

I was trying to upgrade my droplet from Ubuntu 20.x to Ubuntu 22.x using this guide. Now my networking doesn’t work.

  • I can only access the droplet through the recovery terminal, so copy-pasting details is not possible.
  • When using the terminal, I can ping localhost, but I can’t ping the gateway.
  • DNS doesn’t work because the network is totally unreachable.
  • ufw status shows ssh port is LIMIT IN from Anywhere and: deny (incoming), allow (outgoing), disabled (routed).
  • /etc/netplan/50-cloud-init.yaml file shows one entry for “ens3”.
  • “ip a” shows two interfaces: “lo” (state UNKNOWN) and “ens3” (state UP).
  • “ip route” does not return anything.

How do I troubleshoot this?

Thanks for any help!

  • Andy

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Accepted Answer

To answer my own question via DO support (thanks Mubashir!)…

The issue was with “systemd’s predictable network interface naming”.

The solution was to turn it off via GRUB.

  • edit /etc/default/grub.d/50-cloudimg-settings.cfg and add net.ifnames=0 at the end of GRUB_CMDLINE_LINUX_DEFAULT:

GRUB_CMDLINE_LINUX_DEFAULT=“console=tty1 console=ttyS0 net.ifnames=0”

  • then: