The 3.4 version of the ttf-mecorefonts-installer package is broken.
Sourceforge (where the actual font files are downloaded from) changed the location that the fonts are stored rendering the package broken. I'd suggest purging that broken 3.4 version of the package and instead install the 3.6 version of the package from an alternative source, eg
To get rid of the current package
sudo apt purge ttf-mscorefonts-installer
To download the 3.6 version of the package to your Downloads folder
wget http://ftp.de.debian.org/debian/pool/contrib/m/msttcorefonts/ttf-mscorefonts-installer_3.6_all.deb -P ~/Downloads
To install the new package.
sudo apt install ~/Downloads/ttf-mscorefonts-installer_3.6_all.deb
Thats All!