Why have my Ubuntu 22.04 systems got different versions of some packages?

[Chris Green]

While investigating the recent "kept back" issue I have noticed that
one of my [x]ubuntu systems has got a newer/different version of some
packages than my other systems.

For example on my system 'backup' I see:-

chris at backup$ dpkg -l | grep libnotify-bin
ii  libnotify-bin                         0.7.9-3ubuntu5.22.04.1 amd64        sends desktop notifications to a notification daemon (Utilities)

Whereas on my system 'esprimo' I see:-

chris$ dpkg -l | grep libnotify-bin
ii  libnotify-bin                             0.7.9-3ubuntu5 amd64        sends desktop notifications to a notification daemon (Utilities)


These two systems are both running ubuntu 22.04 and the hardware is
*very* similar.  Both are Fujitsu Esprimo, same model, the only
difference really being that they have a different mix of disk drives.


-- 
Chris Green