I looked around a bit and I found the easy built-in way to disable the individual components of whonixcheck.
In /etc/whonix.d/30_whonixcheck_default I uncommented the line
and now whonixcheck isn’t complaining anymore.
user@host:/etc/whonix.d$ whonixcheck
[INFO] [whonixcheck] Tor Bootstrap Result: Connected to Tor.
[INFO] [whonixcheck] Whonix is produced independently of, with no guarantee from, The Tor Project. Whonix is experimental software. Do not rely on it for strong anonymity. https://www.whonix.org
[INFO] [whonixcheck] SocksPort Test: Testing Tor's SocksPort...
[INFO] [whonixcheck] SocksPort Test Result: Connected to Tor. IP: xxx.xxx.xxx.xxx
[INFO] [whonixcheck] TransPort Test: Testing Tor's TransPort...
[INFO] [whonixcheck] TransPort Test Result: Connected to Tor. IP: xxx.xxx.xxx.xxx
[INFO] [whonixcheck] Stream Isolation Test Result: Functional.
INFO: Skipping download_whonix_news, because whonixcheck_skip_functions includes it.
[INFO] [whonixcheck] Debian Package Update Check: Checking for software updates via apt-get...
[INFO] [whonixcheck] Debian Package Update Check Result: No updates found via apt-get.
[INFO] [whonixcheck] Whonix APT Repository: Enabled.
When the Whonix team releases TESTERS updates, they will be AUTOMATICALLY installed (when you run apt-get dist-upgrade) along with updated packages from the Debian team. Please read https://whonix.org/wiki/Trust to understand the risk. If you want to change this, use:
sudo whonix_repository
[INFO] [whonixcheck] Tor Browser Update Check: Checking version...
[INFO] [whonixcheck] Tor Browser Update Check Result: Up to date.
As for using the Whonix components in Ubuntu, all that was required as of version 14.04 was to add the whonix and torproject repositories to the apt sources and all the dependencies were met. I’m still testing to see if something maybe missing under the hood.