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i upgraded my older 18.04 LTS version with do-release-upgrade. I had to uninstall mate-desktop to get to the upgrade. Nevertheless, i now get greeded with:

Welcome to Ubuntu 20.04.2 LTS (GNU/Linux 4.9.241-113 aarch64)

and meanwhile the upgrade procedure i got the following problem:

Setting up initramfs-tools (0.136ubuntu6.4) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for flash-kernel (3.103ubuntu1~20.04.1) ...
Unsupported platform.
dpkg: error processing package flash-kernel (--configure):
 installed flash-kernel package post-installation script subprocess returned error exit status 1
Processing triggers for initramfs-tools (0.136ubuntu6.4) ...
update-initramfs: Generating /boot/initrd.img-5.8.0-44-generic-64k
Unsupported platform.

I not exactly know what happens here, but i think the new kernel version has no arm64 candidate and failed to install? Everything, else had an successful update, despite the kernel? What can i do to get rid of this error, is there any option to tell ubuntu to stick with the old kernel? Are there any pitfalls if i use the new version with an old kernel?

lkaupp
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1 Answers1

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The flash-kernel package version number looks "suspicious". Please note that third party repositories should have been deactivated during the do-release-upgrade procedure in your case (see do-release-upgrade disables third party software sources which also explains how you can prevent this in the future). You'd need to (re-)add the following repository in order to see a modified version of the flash-kernel package:

[2021-04-29T23:07:52+0200] root@odroid01:~# cat /etc/apt/sources.list.d/ppa-linuxfactory-or-kr.list
deb http://ppa.linuxfactory.or.kr focal main non-free contrib
deb-src http://ppa.linuxfactory.or.kr focal main non-free contrib
[2021-04-29T23:08:03+0200] root@odroid01:~# LANG=C apt policy flash-kernel
flash-kernel:
  Installed: 5:3.99+202104021221~focal
  Candidate: 5:3.99+202104021221~focal
[...]
Markus Ueberall
  • 551
  • I the meantime i reinstalled the OS using one of the linked version in the hardware kernel wiki – lkaupp May 05 '21 at 08:36