Removing ttf-mscorefonts-installer

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http://askubuntu.com – The package ttf-mscorefonts-installer is showing up in Update Manager as having been downloaded but not installed. When I run sudo apt-get remove ttf-mscorefonts-installer I get the message dpkg: warning: there's no installed package matching ttf-mscorefonts-installer:amd64 I can't uncheck the box next to ttf-mscorefonts-installer in the Update Manager interface, and I can't install any other updates because I get the error message Requires installation of untrusted packages The action would require the installation of packages from not authenticated sources. How do I get rid (HowTos)