Release 22.04.5 LTS (Jammy Jellyfish) 64-bit
Kernel Linux 6.8.0-52-generic x86_64
MATE 1.26.0
Since a recent security update I have noticed NO keyboard I have tested responds to the number pad keys, including shortcurs, eg Ctl-+ to zoom.
Additionally, when booting, the password (numerical in my case) can be entered via the number pad. which loses functionality immediately after.
Any help is much appreciated.
My install is identical to yours but my keyboard works ok:
Release 22.04.5 LTS (Jammy Jellyfish) 64-bit
Kernel Linux 6.8.0-52-generic x86_64
MATE 1.26.0
Could it be a hardware problem ?
You might try another keyboard first.
Its not the keybnoards. Trieid a couple of kb s, all the same, but work OK on my other desktops.
Must be software. Why is the numbe rpad working to let me type the (numeric) password and hen shut off ?
Probably you could verify what keyboard model is (mis)configured in your system. Select System > Preferences > Hardware > Keyboard menu entry, go to Layouts tab and verify keyboard model for presence of numpad keys.
Oh, just forgot to mention possible problems with numlock state
Eugene, do you know the name of the utility used, during distro install, which pops-up a GUI interacting with the user to help identify the keyboard thru directing them to press on keys or answer questions about keys/layouts available?
I wanted to offer that up as a tool to help identify what the OS believes the keyboard layout/type is, but also offers all the other available layout identifiers to select from.
Maybe one of those others would fit the OP's laptop layout, even if it has a different name. ( That's what I did with my own keyboard! 
)
Eric, I do not know the name of the utility in question and have no idea if it can be extracted from the installer. Well, mentioned keyboard preferences dialogue allows to select keyboard model and see keys layout using Show button...
I think I found it:
dpkg-reconfigure keyboard-configuration
That should work thru the process to properly recognize the keyboard and features, or close to it.
Once you have a working keyboard, you can then work on tweaking that selection/configuration.
And, once completed, to your satisfaction, you can have the system display the applicable layout any time by entering the command:
gkbd-keyboard-display -l $(localectl status | awk '/X11 Layout/ {print $3}')$'\t'$(localectl status | awk '/X11 Variant/ {print $3}')
I confirmed that on my own computer, just now.
