*** This bug is a duplicate of bug 2054761 ***
https://bugs.launchpad.net/bugs/2054761
Same issue occurred for me today on upgrade from 22.04 to 24.04. There
was some error during the initial upgrade, causing it to exit and it had
to be resumed. After the upgrade completed, `/etc/resolv.conf/` was
linked to `/run/systemd/resolve/stub-resolv.conf` however this file did
not exist. The package `systemd-resolved` was not installed or marked
for installation. To fix this, I installed the package resulting in
`/run/systemd/resolve/stub-resolv.conf` being generated, and after a
`sudo systemctl restart NetworkManager.service` DNS resolution worked
again.
Here is what I see in the relevant `main.log`:
```
2024-09-19 19:15:49,942 DEBUG Disabling systemd-resolved stub resolver during
upgrade
2024-09-19 19:15:50,112 DEBUG apt btrfs snapshots supported: False
2024-09-19 19:15:50,112 INFO cache.commit()
2024-09-20 15:46:53,054 ERROR got an error from dpkg for pkg:
'/tmp/apt-dpkg-install-hysakR/32-firefox_1%3a1snap1-0ubuntu5_amd64.deb': 'new
firefox package pre-installation script subprocess returned error exit status 1'
2024-09-20 15:46:53,055 DEBUG running apport_pkgfailure() firefox: new firefox
package pre-installation script subprocess returned error exit status 1
2024-09-20 15:46:58,303 ERROR Exception during pm.DoInstall()
Traceback (most recent call last):
File "/tmp/ubuntu-release-upgrader-mkvb_fzo/DistUpgrade/DistUpgradeView.py",
line 220, in run
res = pm.do_install(self.writefd)
apt_pkg.Error: E:Sub-process /usr/bin/dpkg returned an error code (1)
2024-09-20 15:46:58,333 ERROR SystemError from cache.commit():
installArchives() failed
2024-09-20 15:46:58,333 ERROR found exception: 'E:Sub-process /usr/bin/dpkg
returned an error code (1)'
2024-09-20 15:47:00,255 DEBUG Running PostInstallScript:
'./xorg_fix_proprietary.py'
2024-09-20 15:47:00,286 DEBUG Running PostInstallScript:
'/usr/lib/ubuntu-advantage/convert_list_to_deb822.py'
2024-09-20 15:47:00,502 DEBUG Running PostInstallScript:
'/usr/lib/ubuntu-advantage/upgrade_lts_contract.py'
```
So it seems like there was an unrelated error with the Firefox snap
installer. Perhaps the underlying problem is that `systemd-resolved` is
not properly reconfigured after upgrade errors?
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https://bugs.launchpad.net/bugs/2055012
Title:
When I upgraded from 22.04 to 24.04, DNS resolution went wrong.
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