boot error, cannot upgrade kernel

[Gary Aitken]

On 1/9/22 3:53 AM, Liam Proven wrote:
> On Fri, 7 Jan 2022 at 21:10, Gary Aitken <ubuntu at dreamchaser.org> wrote:
>>
>> I've tried repairing it with a Ubuntu 21.10 USB stick; but I can't find a
>> way to repair the boot from that.  I see only two options:
> 
> This isn't Windows. You can't use Windows techniques or methods and if
> you try you will probably break things.

> Google. Always Google. Google for advice on how to fix it.

never ask google if you value your privacy, use something like duckduckgo...

That said, I subsequently found numerous references for what I needed to
do to rewrite the boot from the usb stick.

Unfortunately, none of them solved my problem, although they did rewrite
the boot sector (I assume).  Upgrading the kernel after rewriting the boot
blocks, then rebooting, fails with the same error,

   Error: can't find command  'hwmatch'
   Error: file /boot/vmlinuz-5.15.6-091906-generic has invalid signature

I believe I am going to have to reinstall from scratch.

Gary