do-release-upgrade from cosmic to disco make the network of this specific machine malfunction

[Taihsiang Ho]

Hardware: Dell Vostro 5568 (CID 201606-22344)

[Steps To Reproduce]
1. Install cosmic on this machine
2. Connect to the internet with ethernet
3. do-release-upgrade

[Expected Result]
Upgrade completes. The wired connection is ready to access the internet.

[Actual Result]
- The ethernet interface has an IP address assigned by the associated DHCP (checked by "ip -a")
- "ping 8.8.8.8" will get "Destination Host Unreachable"

[More Information]
I tried the same steps on different machine-distro matrix[1] and could only reproduce the issue on this machine.

[1] distro are: xenial-to-bionic, bionic-to-cosmic, cosmic-to-disco

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[Logs]

- /var/log tarball of the system: the attachment 201606-22344-network-manager-nplusone-190312.var-log.tar.gz

- Collected by "ubuntu-bug network-manager": /media/tai271828/certsd/201606-22344-network-manager-nplusone-190312.ubuntu.bug

[Will Cooke (willcooke)]

I'm untargetting the specific releases so that this doesn't show up in our weekly reports. I would like to see some more debugging and to better understand why it's just this one machine. It doesn't yet sound like this is a release critical bug.

[Paul White (paulw2u)]

Ubuntu 18.10 (cosmic) reached end-of-life on July 18, 2019.
Ubuntu 19.04 (disco) reached end-of-life on January 23, 2020.

Both releases are now EOL. Further to comment #3 I'm setting this bug to "Incomplete".

If this is still when upgrading from/to currently maintained releases of Ubuntu then please let us know otherwise this bug report can be left to expire in approximately 60 days time.

Paul White
[Ubuntu Bug Squad]

[Launchpad Janitor (janitor)]

[Expired for Ubuntu because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for network-manager (Ubuntu) because there has been no activity for 60 days.]