[Bug 1970761] Re: Upgrades to 22.04 can cause netplan failures on Raspi

[Łukasz Zemczak]

Hello William, or anyone else affected,

Accepted ubuntu-release-upgrader into jammy-proposed. The package will
build now and be available at
https://launchpad.net/ubuntu/+source/ubuntu-release-upgrader/1:22.04.11
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
jammy to verification-done-jammy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-jammy. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: ubuntu-release-upgrader (Ubuntu Jammy)
       Status: Confirmed => Fix Committed

** Tags added: verification-needed verification-needed-jammy

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https://bugs.launchpad.net/bugs/1970761

Title:
  Upgrades to 22.04 can cause netplan failures on Raspi

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed
Status in ubuntu-release-upgrader source package in Jammy:
  Fix Committed

Bug description:
  [Impact]
      * In Jammy, Netplan commands fail if the following
        lines are present in the netplan config file:
        ```
        match:
           driver: bcmgenet smsc95xx lan78xx
        ```
      * Those lines are present in the default netplan config
        for Raspberry Pis in focal, hirsute, and impish
      * As a result, upgrades to jammy from older releases
        lead to netplan failures and broken networking

  [Test Plan]
      * Install impish on a Raspberry Pi
      * Upgrade to jammy using `do-release-upgrade -d`
      * Run `sudo netplan apply` and observe the command
        fails and the networking does not work
      * Reinstall impish on the Raspberry Pi
      * Upgrade to jammy using `do-release upgrade -d` with
        the proposed pocket enabled
      * Run `sudo netplan apply` and observe that the
        command succeeds and networking is functional

  [Regression Potential]
      * Since ubuntu-release-upgrader is modifying
        netplan's config, it is possible that custom
        configs could be impacted where not intended.

  [Original Description]
  The default netplan yaml configuration file on Raspi for older releases is

  ```
  network:
      ethernets:
          eth0:
              dhcp4: true
              match:
                  driver: bcmgenet smsc95xx lan78xx
              optional: true
              set-name: eth0
      version: 2
  ```

  In the version of netplan in jammy, the match section is no longer
  needed and causes netplan failures due to incompatible formatting. A
  quirk should be made to remove the match section.

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