I've seen enough successful builds of 2.14.0 to make me think that the issue is likely not in the build instructions. The best place to ask this question may be the Librealsense GitHub page, as they deal with these kind of installation questions all the time. You can do so by visiting the link below and clicking the 'New Issue' button.
Posted to GITHUB per MartyG's suggestion, here should anyone else have this problem:
I'll note that we have other Ubuntu 18.04 machines (they were built a few weeks back and are running libRS 2.11), and this problem occurred this time when we built our most recent machine (from a fresh/blank drive). It's probably a timing issue where Ubuntu is in a bad state, but, nevertheless, it is presenting a problem for us to move forward with additional developer machines.
This message was posted on behalf of Intel Corporation
We noticed that your ticket on GitHub has been updated with the following suggested solution:
It seem that the distribution has some missing/broken packages.
You can run dpkg -l | grep ^..r to list those, and then use Ubuntu tools to rectify it
sudo apt update --fix-missing and
sudo apt install -f <package_name>
Please let us know if this solved your issue.
Intel Customer Support
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Could you please let us know if you require further assistance with this query?
Thank you in advance,