Comment 2 for bug 1652907

Same issue for me

As workaround, I have edited my /usr/share/package-data-downloads/ttf-mscorefonts-installer file and replace http://downloads.sourceforge.net/corefonts with https://<MIRROR>/project/corefonts/the%20fonts/final for each components.
where <MIRROR> is my sourceforge mirror default server.

I replaced the white space with %20

Example : if you mirror is https://pilotfiber.dl.sourceforge.net you can replace http://downloads.sourceforge.net/corefonts with https://pilotfiber.dl.sourceforge.net/project/corefonts/the%20fonts/final