[Bug 1889449] Re: 18.04 to 20.04.1 upgrade on raspberry pi removes too many kernel meta packages

[Francis Ginther]

** Tags added: id-5f242f6be5acef7246cd5459

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https://bugs.launchpad.net/bugs/1889449

Title:
  18.04 to 20.04.1 upgrade on raspberry pi removes too many kernel meta
  packages

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Focal:
  In Progress

Bug description:
  In a raspberry pi system running 18.04, when running "do-release-upgrade -d" to upgrade to 20.04.1,
  the transition from linux-raspi2-hwe-18.04 to linux-raspi doesn't seem to be done correctly and the system ends up without this and the linux-headers-raspi meta packages.

  These are the meta packages installed before the release upgrade:

  ii  linux-headers-raspi2-hwe-18.04      5.3.0.1017.6                        arm64        Linux kernel headers for Raspberry Pi systems.
  ii  linux-image-raspi2-hwe-18.04        5.3.0.1017.6                        arm64        Linux kernel image for Raspberry Pi systems.
  ii  linux-raspi2-hwe-18.04              5.3.0.1017.6                        arm64        Complete Linux kernel for Raspberry Pi systems.

  After the upgrade is complete this is the only kernel meta installed:

  ii  linux-image-raspi               5.4.0.1015.50
  arm64        Raspberry Pi Linux kernel image

  During the upgrade, these kernel packages update are made:

  Selecting previously unselected package linux-raspi-headers-5.4.0-1015.
  Preparing to unpack .../244-linux-raspi-headers-5.4.0-1015_5.4.0-1015.15_arm64.deb ...
  Unpacking linux-raspi-headers-5.4.0-1015 (5.4.0-1015.15) ...
  Selecting previously unselected package linux-headers-5.4.0-1015-raspi.
  Preparing to unpack .../245-linux-headers-5.4.0-1015-raspi_5.4.0-1015.15_arm64.deb ...
  Unpacking linux-headers-5.4.0-1015-raspi (5.4.0-1015.15) ...
  Selecting previously unselected package linux-headers-raspi.
  Preparing to unpack .../246-linux-headers-raspi_5.4.0.1015.50_arm64.deb ...
  Unpacking linux-headers-raspi (5.4.0.1015.50) ...
  Selecting previously unselected package linux-modules-5.4.0-1015-raspi.
  Preparing to unpack .../247-linux-modules-5.4.0-1015-raspi_5.4.0-1015.15_arm64.deb ...
  Unpacking linux-modules-5.4.0-1015-raspi (5.4.0-1015.15) ...
  Selecting previously unselected package linux-image-5.4.0-1015-raspi.
  Preparing to unpack .../248-linux-image-5.4.0-1015-raspi_5.4.0-1015.15_arm64.deb ...
  Unpacking linux-image-5.4.0-1015-raspi (5.4.0-1015.15) ...
  Selecting previously unselected package linux-image-raspi.
  Preparing to unpack .../249-linux-image-raspi_5.4.0.1015.50_arm64.deb ...
  Unpacking linux-image-raspi (5.4.0.1015.50) ...
  Selecting previously unselected package linux-raspi.
  Preparing to unpack .../250-linux-raspi_5.4.0.1015.50_arm64.deb ...
  Unpacking linux-raspi (5.4.0.1015.50) ...
  Preparing to unpack .../251-linux-raspi2-hwe-18.04_5.4.0.1015.50_arm64.deb ...
  Unpacking linux-raspi2-hwe-18.04 (5.4.0.1015.50) over (5.3.0.1030.20) ...
  Preparing to unpack .../252-linux-headers-raspi2-hwe-18.04_5.4.0.1015.50_arm64.deb ...
  Unpacking linux-headers-raspi2-hwe-18.04 (5.4.0.1015.50) over (5.3.0.1030.20) ...
  Preparing to unpack .../253-linux-image-raspi2-hwe-18.04_5.4.0.1015.50_arm64.deb ...
  Unpacking linux-image-raspi2-hwe-18.04 (5.4.0.1015.50) over (5.3.0.1030.20) ...

  
  At the end of the upgrade process, do-release-upgrade calculates the obsolete packages and remove the following kernel packages:

    linux-headers-5.3.0-1017-raspi2 
    linux-headers-5.3.0-1030-raspi2 linux-headers-5.4.0-1015-raspi 
    linux-headers-raspi linux-headers-raspi2-hwe-18.04 
    linux-image-5.3.0-1017-raspi2 linux-image-raspi2-hwe-18.04 
    linux-modules-5.3.0-1017-raspi2 linux-raspi 
    linux-raspi-headers-5.4.0-1015 linux-raspi2-5.3-headers-5.3.0-1017 
    linux-raspi2-5.3-headers-5.3.0-1030 linux-raspi2-hwe-18.04 

  Please note that the flavour of the raspberry pi kernel changed from
  "raspi2" on 18.04 to "raspi" on 20.04. The transitional packages in
  20.04 seem to be correct, so this behaviour is likely an issue with
  do-release-upgrade not handling this rename correctly and removing too
  many packages.

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