For people that are affected by this issue, some things that you might try to get your system back in shape:
A) sudo apt-get install --reinstall ttf-mscorefonts-installer
B) sudo apt-get remove --purge ttf-mscorefonts-installer; sudo apt-get install ttf-mscorefonts-installer
C) sudo dpkg-reconfigure ttf-mscorefonts-installer
This is an either or list. If one of them fixes the problem for you, don't try the others :). Also, if you are affected by this problem and one of these things fixes it, please report how your breakage looked like and which option fixed it.
For people that are affected by this issue, some things that you might try to get your system back in shape:
A) sudo apt-get install --reinstall ttf-mscorefonts -installer
B) sudo apt-get remove --purge ttf-mscorefonts -installer; sudo apt-get install ttf-mscorefonts -installer
C) sudo dpkg-reconfigure ttf-mscorefonts -installer
This is an either or list. If one of them fixes the problem for you, don't try the others :). Also, if you are affected by this problem and one of these things fixes it, please report how your breakage looked like and which option fixed it.