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Pale Moon is NOT in official package repositories. Steve Pusser is maintaining an unofficial repository with the latest Pale Moon for Debian/Ubuntu. Replace the version with what most closely matches your system. replace 16.04 with 15.10, 14.04, or 12.04. sudo sh -c "echo 'deb http://download.opensuse.org/repositories/home:/stevenpusser/xUbuntu_16.04/ /' >> /etc/apt/sources.list.d/palemoon.list"