You appear to have not upgraded 'dpkg':
dpkg: regarding .../udev_229-4ubuntu21.29_amd64.deb containing udev,
pre-dependency problem:
udev pre-depends on dpkg (>= 1.17.14)
dpkg is installed, but is version 1.17.5ubuntu5.8+esm1.
The latest version in Xenial is 1.18.4ubuntu1.6.
Please upgrade dpkg and you'll then be able to upgrade udev.
** Changed in: systemd (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1912382
Title:
package udev 229-4ubuntu21.29 failed to install/upgrade: pre-
dependency problem - not installing udev
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