I have a lenovo thinkpad T420s and there are a few keys which are also numbers & letters. I can login ok which tells me before login it is detecting the keyboard correctly then after login when i press these keys its is displaying the numbers not the letters, anyone else encountered this? Using external keybord on docking station works ok just not the native laptop keyboard. I'm running mate 1.26.0
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Just deactivate numlock at boot. 
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Welcome @dattorob to the community!
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Thanks that worked , in BIOS went in and changed the Numlock enable on boot set to independent of external keyboard, essentially achieved the same thing. cheers
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