Comment 24 for bug 1607535

Revision history for this message
notsure (notsure) wrote : Re: ttf-mscorefonts-installer 3.4+nmu1ubuntu2 fails to install core fonts and should be updated to version 3.6 from Debian

You can try my workaround:
edit your /usr/share/package-data-downloads replacing all
http://downloads.sourceforge.net/corefonts/
with
https://freefr.dl.sourceforge.net/project/corefonts/the%20fonts/final/

remove all partial download with
rm -rf /var/lib/update-notifier/package-data-downloads/partial

change your partial download directory permissions with
sudo chmod 777 /var/lib/update-notifier/package-data-downloads/partial
or solve the problem of the _apt user with
sudo adduser --force-badname --system --home /nonexistent \ --no-create-home --quiet _apt || true

and restart the update process with
sudo /usr/lib/update-notifier/package-data-downloader