Remove 4.* series kernel from 18.04

[Jonesy]

In gmane.linux.ubuntu.user, you wrote:
> On 27/4/23 06:36, jon danniken wrote:
>> Hello list, some time ago I installed the Hardware Enablement (hwe)
>> kernel on my 18.04 box.
>
> I am wondering about the wisdom of running 18.04, when it is now five
> years out of date, and, two LTS versions have since been released; 20.04
> and 22.04.

Wonder all you want.  I'm still happily running 16.04 with ESM.
And, with Ubuntu growing ever more squirrely, my next 'upgrade' 
will probably be to Debian.

Jonesy
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