apt description refers to apparently non-existent package

[Jeff Abrahamson]

The description in `apt-cache show` ends with this paragraph:

    Note that MariaDB also comes with an included version of the client library.
    The main reason to use this package, rather than libmariadbclient-dev, is
    differences in licensing: this package uses the LGPL, while
    libmariadbclient-dev uses the GPL.

But the package libmariadbclient-dev appears no longer to exist in 15.10 (nor in 16.04).

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: libmariadb-client-lgpl-dev (not installed)
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: i3
Date: Wed Aug 10 15:04:53 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-10-23 (291 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: mariadb-client-lgpl
UpgradeStatus: Upgraded to xenial on 2016-05-16 (85 days ago)