Error installing nagios3-doc: All `Format' sections are invalid.

Upon 'apt-get install nagios3-doc' in Ubuntu 14.10, I get this error:

Preparing to unpack .../nagios3-doc_3.5.1-1ubuntu2_all.deb ...
Unpacking nagios3-doc (3.5.1-1ubuntu2) ...
Processing triggers for doc-base (0.10.6) ...
Processing 1 added doc-base file...
Error in `/usr/share/doc-base/nagios3', line 9: all `Format' sections are invalid.
Note: `install-docs --verbose --check file_name' may give more details about the above error.

The output of 'install-docs --verbose --check /usr/share/doc-base/nagios3':
Warning in `/usr/share/doc-base/nagios3', line 9: file `/usr/share/nagios3/htdocs/docs/index.html' does not exist.
Error in `/usr/share/doc-base/nagios3', line 9: all `Format' sections are invalid.
/usr/share/doc-base/nagios3: Fatal error found, the file won't be registered.

Looking in /usr/share/doc/nagios3-doc, there is a softlink html pointing to
/usr/share/nagios3/htdocs/docs/. That directory contains only a directory
images, which is empty.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: nagios3-doc 3.5.1-1ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Nov 5 12:27:51 2014
Dependencies:

InstallationDate: Installed on 2013-09-28 (402 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
PackageArchitecture: all
SourcePackage: nagios3
UpgradeStatus: Upgraded to utopic on 2014-10-30 (5 days ago)