I checked these forums a few months ago to see if anyone had the same issue... I didn't find anything. Now I randomly hop on the forum to see if there's any release schedule about an upcoming Maui release now that Ubuntu 18.04 is around the corner, and see this. 
Anyway, I get this same issue too. I have it on my laptop, my desktop, and the family computer. Previously, typing my password on the physical keyboard wouldn't work, I'd have to use the virtual onscreen keyboard. However, it seems typing on the physical keyboard may work now, but I haven't tested it much.
I haven't tested it much, because there's a little keyboard looking button on the bottom right hand corner of the screen that you can press to make the virtual keyboard go away so you can type in your password as normal.
This isn't remotely persistent as the next time you try to login, the issue will be back and you'll need to click on that button again, but it is nice to be able to get the virtual keyboard out of the way at least.
Anyway, I get this same issue too. I have it on my laptop, my desktop, and the family computer. Previously, typing my password on the physical keyboard wouldn't work, I'd have to use the virtual onscreen keyboard. However, it seems typing on the physical keyboard may work now, but I haven't tested it much.
I haven't tested it much, because there's a little keyboard looking button on the bottom right hand corner of the screen that you can press to make the virtual keyboard go away so you can type in your password as normal.
This isn't remotely persistent as the next time you try to login, the issue will be back and you'll need to click on that button again, but it is nice to be able to get the virtual keyboard out of the way at least.