Ctrl-x x not recognised in Ubuntu 22.04

[Bill Purvis]

Hi, I've just upgraded to Ubuntu 22.04 (as 21.10 is now out of support) 
and find that when I type 'ctrl-x x'
is says 'C-x x is undefined' I have been using 'C-x x t' to enable line 
truncation, it worked fine with
21.10, but now in 22.04 I can't do it.

C-h k also says C-x x is undefined.

Has something changed?

Bill

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+----------------------------------------+
| Bill Purvis                            |
| email: bill@billp.org                  |
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