so, I downloaded via browser http://downloads.sourceforge.net/project/ubuntuzilla/mozilla/apt/pool/main/f/firefox-mozilla-build/firefox-mozilla-build_10.0.1-0ubuntu1_i386.deb and then ran sudo dpkg -i firefox-mozilla-build_10.0.1-0ubuntu1_i386.deb and Update Manager now says that there is no more updates to install! Thanks for your sudo help!
so, I downloaded via browser http:// downloads. sourceforge. net/project/ ubuntuzilla/ mozilla/ apt/pool/ main/f/ firefox- mozilla- build/firefox- mozilla- build_10. 0.1-0ubuntu1_ i386.deb and then ran sudo dpkg -i firefox- mozilla- build_10. 0.1-0ubuntu1_ i386.deb and Update Manager now says that there is no more updates to install! Thanks for your sudo help!