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

[William Wilson]

** Description changed:

- The default netplan yaml configuration file on Raspi for older releases
- is
+ [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
+     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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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:
  New
Status in ubuntu-release-upgrader source package in Jammy:
  New

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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