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[xubuntu] Requires installation of untrusted packages

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http://ubuntuforums.org – I can t update firefox,this is the message: "Requires installation of untrusted packages " firefox firefox-globalmenu firefox-gnome-support firefox-locale-en firefox-locale-zh-hans flashplugin-installer libtiff4 linux-generic linux-headers-3.2.0-44 linux-headers-3.2.0-44-generic linux-headers-generic linux-image-3.2.0-44-generic linux-image-generic linux-libc-dev thunderbird thunderbird-globalmenu thunderbird-locale-en thunderbird-locale-en-us any help much appreciated. (Hardware)