ubuntu-mozilla-securityのPPAを追加した。
You can update your system with unsupported packages from this untrusted PPA by adding ppa:ubuntu-mozilla-security/ppa to your system's Software Sources.
apt-add-repositoryコマンドで追加し、update, upgradeを行なう。
$ sudo apt-add-repository ppa:ubuntu-mozilla-security/ppa $ sudo aptitude update $ sudo aptitude safe-upgrade