It appears package 'systemd-shim' stopped existing after Ubuntu 16.04,
so that's part of the problem. Please try purging it with:
sudo dpkg -P systemd-shim
This bug is either 'Fix Released', 'Invalid' or 'Won't Fix'. Because
it's not a problem in any package we distribute any more.
** Package changed: xorg (Ubuntu) => systemd-shim (Ubuntu)
** Changed in: systemd-shim (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1890012
Title:
Could not install 'systemd-shim'
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