Eliminate ver 24 upgrade nag-ware

[Robert Moskowitz]

I am building this Ubuntu server for running Mail-in-a-Box which 
requires Ubuntu 22.04 and from their forum I gather they have no plans 
for support for Ubuntu 24, but will jump to 26.  At some point.

So how can I get rid of the

New release '24.04.2 LTS' available.
Run 'do-release-upgrade' to upgrade to it.

message on login?


Thanks