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
