apt - xkeyboard-config: command not found and can't install it either

I am trying to set up Xpra on my headless Ubuntu server and in the process of trying to fix a problem I'm having (specifically, a XKB: Could not invoke xkbcomp error), I came across the advice that I should install and configure xkeyboard-config.

However, when I tried to run xkeyboard-config, the command was not found. I then tried to install xkeyboard-config but apt-get told me that Package xkeyboard-config is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source. I did find this which says that the package was deleted for Cosmic but doesn't mention alternatives:
https://www.ubuntuupdates.org/package/core/cosmic/universe/proposed/xkeyboard-config

Can someone please help get xkeyboard-config installed and set up? Thanks.

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Edit: I forgot to mention that right after the XKB: Could not invoke xkbcomp error, the Xorg log had the following line:
Keyboard initialization failed. This could be a missing or incorrect setup of xkeyboard-config.

This is why I am trying to see if there is something wrong with xkeyboard-config before I try other troubleshooting steps.

The source package named xkeyboard-config is available in all Ubuntu releases:

1. see its page on packages.ubuntu.com.
2. see output of locally ran rmadison xkeyboard-config:

$ rmadison xkeyboard-config
 xkeyboard-config | 2.5-1ubuntu1            | precise         | source
 xkeyboard-config | 2.5-1ubuntu1.5          | precise-updates | source
 xkeyboard-config | 2.10.1-1ubuntu1         | trusty          | source
 xkeyboard-config | 2.16-1ubuntu1           | xenial          | source
 xkeyboard-config | 2.23.1-1ubuntu1         | bionic          | source
 xkeyboard-config | 2.23.1-1ubuntu1         | cosmic          | source
 xkeyboard-config | 2.23.1-1ubuntu1.18.04.1 | bionic-proposed | source
 xkeyboard-config | 2.23.1-1ubuntu1.18.10.1 | cosmic-updates  | source
 xkeyboard-config | 2.23.1-1ubuntu1.18.10.1 | disco           | source

The following binary packages are built from this source package:

xkb-data
   X Keyboard Extension (XKB) configuration data
xkb-data-i18n
   X Keyboard Extension (XKB) configuration data translations
xkb-data-udeb
   X Keyboard Extension (XKB) configuration data

but they do not contain executables, only configuration data.

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About your original problem with xkbcomp - it is available from x11-xkb-utils package. Install it with:

sudo apt-get install x11-xkb-utils