After some further investigating, I have some more information.

-- Comment #14 does indeed complete the installation but does not silence the 
popup. The similar method in Comment #26 does silence the popup.
-- It is right to be concerned that the font files could be corrupted, because 
they are hosted on SourceForge, which recently decided to wrap sleazeware 
around others' software (even though this is specifically prohibited in the 
fonts' EULA). See 
http://www.infoworld.com/article/2929732/open-source-software/sourceforge-commits-reputational-suicide.html
 
-- It might be best for someone else (GitHub? Ubuntu?) to host these files to 
make sure SourceForge doesn't corrupt them. It is possible that this (or the 
SourceForge "cookies" popup) is the root cause of this problem, though I have 
not pursued that. Also, I am often routed to the NetAssist mirror, which 
appears to have been taken down (it's online but empty).
-- In any case, the Ubuntu installer does verify the SHA256 hashes AFTER the 
download.

So this method should work (riffing off comments #14 and #26, along with
a solution offered in http://askubuntu.com/questions/317765/how-do-i
-stop-failure-to-download-extra-data-files-error-with-pepflashpluginin)
...

cd /var/lib/update-notifier/package-data-downloads/partial
grep Url: /usr/share/package-data-downloads/ttf-mscorefonts-installer | awk 
'{print $2}' | sudo xargs -n 1 'wget'
cd -
sudo /usr/lib/msttcorefonts/update-ms-fonts 
/var/lib/update-notifier/package-data-downloads/partial/*
sudo rm -f /var/lib/update-notifier/package-data-downloads/partial/*
sudo mv 
/var/lib/update-notifier/package-data-downloads/ttf-mscorefonts-installer.FAILED
 /var/lib/update-notifier/package-data-downloads/ttf-mscorefonts-installer

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https://bugs.launchpad.net/bugs/1371783

Title:
  package ttf-mscorefonts-installer 3.4+nmu1ubuntu2 (utopic) fails to
  install/upgrade

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