Analysis:

This is caused by keyboard-configuration trying and failing to detect a
keyboard.

It detects my USB keyboard using InterfaceClass 03, InterfaceSubClass 01, and 
InterfaceProtocol 01 in /sys/bus/usb/devices/ .
It detects the built-in keyboard on my other computer using "AT Set" in 
/proc/bus/input/devices .
However it does not detect the Surface Type Keyboard ('N: Name="Microsoft 
Surface Type Cover Keyboard"') in /proc/bus/input/devices .

The problem is in the keyboard_present() function of line 36230 of
/var/lib/dpkg/info/keyboard-configuration.config .

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https://bugs.launchpad.net/bugs/1858090

Title:
  Surface Type Cover not detected by dpkg-reconfigure keyboard-
  configuration

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