Insists in reporting an unsuccessful extra download

[Uqbar]

Every while and then I get a notification stating that there is a

Extra data file download unsuccessful

And it mentions a file called ttf-mscorefonts-installer and says the system will try the download in the future and proposes to accomplish the action now by clicking on a button.
If I do so, the action fails with this message:

ttf-mscorefonts-installer: processing...
ttf-mscorefonts-installer: downloading http://downloads.sourceforge.net/corefonts/andale32.exe
Err:1 http://downloads.sourceforge.net/corefonts/andale32.exe
  404 Not Found
W: Can't drop privileges for downloading as file '/var/lib/update-notifier/package-data-downloads/partial/andale32.exe' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permesso negato)
E: Impossibile recuperare https://netix.dl.sourceforge.net/project/corefonts/the fonts/final/andale32.exe 404 Not Found

E: Scaricamento non riuscito

Despite I have installed the installer myself, this error is popping out with these annoying dialogs.
It's clearly an error in detecting the actual need for the installation and there is possible wrong URL to download the packages.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: kded5 5.18.0-0ubuntu1
Uname: Linux 4.8.9-040809-lowlatency x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Nov 26 15:11:19 2016
SourcePackage: kded
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Yvon TANGUY (vono22)]

I think the problem is more in msttcorefonts than kded.