Version mismatches - upgrade on Ubuntu 22.04 from rdiff-backup 2.0.5 to 2.2.2 or 2.2.6

[Dominic Raferd]

First, continued thanks for Eric and the team for their great work on 
updating rdiff-backup - really amazing stuff.

Following a system upgrade of my backup server to Ubuntu 23.10, I have 
version mismatches: clients have  (Windows and) Ubuntu 22.04 
(rdiff-backup 2.0.5) whereas the server has rdiff-backup 2.2.2.

I realise that I can upgrade Windows just by changing the .exe file, but 
is there a way to upgrade rdiff-backup on Ubuntu 22.04 from the standard 
2.0.5 to 2.2.2 or indeed to the current latest'n'greatest 2.2.6 (and 
should I expect any problems if I have the latter on a client and 2.2.2 
on the server)? I was hoping for a PPA offering this, but I can't find 
one :(

Dominic