boot error, cannot upgrade kernel

[Gary Aitken]

On 1/7/22 8:23 AM, Liam Proven wrote:
> On Fri, 7 Jan 2022 at 06:15, Gary Aitken <ubuntu at dreamchaser.org> wrote:

>> I then attempted to install the rEFInd multi-boot manager
> 
> OK, I have to ask: why? Grub can multiboot just fine on UEFI without help.

I normally run freebsd, so was going to install that as the primary os.
rEFInd was recommended to me; I've never needed a multiboot environment and
don't have a strong opinion one way or the other as long as it consistently
works.  However, I decided to install Ubuntu as the primary os and did that
before installing any boot loader.  I subsequently tried to install rEFInd
thinking I might need to put a windoze on it, but hoping to avoid it.

>> Subsequently, I have tried to upgrade the kernel; I've tried both 5.14.21
>> and 5.15.6.
> 
> OK, again: how?

As described in https://wiki.ubuntu.com/Kernel/MainlineBuilds
Download .deb files from
   https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D
Verify checksums
sudo dpkg -i *.deb

Gary