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I tried to upgrade from Ubuntu 16.04 to 18.04 using the do-release-upgrade command and post upgrade DNS resolution is failing. My actual intention is to go to 20.04, but since I am on 16.04, I have to go to 18.04 first.

Ping works fine for the google IP but DNS alone fails. I added nameserver 8.8.8.8 in /etc/resolv.conf and /etc/resolvconf/resolv.conf.d/head based on solution provided in No internet after upgrade from 16.04 to 18.04, but when I try to restart networking (sudo /etc/init.d/networking restart), it fails with the below error:

Restarting networking (via systemctl): networking.serviceJob for networking.service failed because the control process exited with error code.
See "systemctl status networking.service" and "journalctl -xe" for details.
 failed!

systemctl status networking.service
● networking.service - Raise network interfaces
   Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2023-09-05 08:25:00 IST; 22s ago
     Docs: man:interfaces(5)
  Process: 4082 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE)
  Process: 4070 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] && udevadm settle (code=exited, status=0/SUCCESS)
 Main PID: 4082 (code=exited, status=1/FAILURE)

How to fix this? Or is there a way to do a clean upgrade again which will fix all these issues?

BeastOfCaerbannog
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Scarlet
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    Ubuntu 18.04 LTS has reached the end of it's standard support life thus is now off-topic here unless your question is specific to helping you move to a supported release of Ubuntu. Ubuntu 18.04 ESM support is available, but not on-topic here, see https://askubuntu.com/help/on-topic See also https://ubuntu.com//blog/18-04-end-of-standard-support Ubuntu PRO & Ubuntu ESM are Canonical services, and not part of community support, this is a community support site – guiverc Sep 05 '23 at 03:18
  • How to upgrade to 20.04 without DNS now? My actual intention is to go to 20.04 but since i was on 16.04, i had to go to 18.04 first – Scarlet Sep 05 '23 at 03:29
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    Your question (as written) doesn't say that, and is off-topic. It's also not clear and specific (Ubuntu Desktop? Ubuntu Server? which kernel stack [default set by install media]) & being a EOSS release, our ability to explore details is reduced. You can non-destructively re-install a Desktop system; which is what I'd do; or if server you just clean install then restore you data., but as 18.04 now requires ESM or Pro to be enabled to fully-upgrade (should be if you used it at 16.04) you've left it too late for community support except for a working 18.04 system upgrade to 20.04 – guiverc Sep 05 '23 at 04:37

0 Answers0