[Lazarus] Keyboard interpreted incorrectly?

[Brian]

Help, please, folks!

I am just returning to using Lazarus for the first time in probably 6
months or so, certainly for the first time since I switched operating
systems. I am now using Linux Mint 19.3 64-bit with an XFCE desktop. I
used fpcupdeluxe and installed the fixes version of both fpc and
lazarus via the button at the bottom of the screen. Everything seemed
to go OK, I could see no error messages in the downloads and build,
and I am now left with (it says) a copy of lazarus v 2.0.7 r 62901 and
fpc 3.2.0.

The problem is when I try to key in my code (and I'm creating a new
program, not an application). Most of the keys work OK, at least that
I have found so far, but an 'i' produces a TAB and then an i, and an
'm' just gives me a new line. The upper case versions of these
characters work as expected, so my temporary workround is obviously to
use those and the formatter, but to say it's a nuisance is an
understatement! I'm using a standard American keyboard layout, and I
have not seen this behaviour in any other application, for sure not in
the copy of thunderbird which I'm using to write this message! I've
also tried a few other applications, and it's only (so far) the
lazarus ide that's afflicted.

Anybody have any ideas, please?


Brian.