Diese Meldung kann bei Ubuntu mit:\r\n
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com B7B9C16F2667CA5C
\r\nbehoben werden. Und gab bei mir folgende Ausgabe:\r\n
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.67NVBHYuVl --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d/dimula73-krita.gpg --keyring /etc/apt/trusted.gpg.d/inkscape_dev-stable.gpg --keyring /etc/apt/trusted.gpg.d/librecad-dev-librecad-stable.gpg --keyring /etc/apt/trusted.gpg.d/libreoffice-ppa.gpg --keyring /etc/apt/trusted.gpg.d/linuxgndu-sqlitebrowser.gpg --keyring /etc/apt/trusted.gpg.d/ondrej-php.gpg --keyring /etc/apt/trusted.gpg.d/ondrej-php5.gpg --keyring /etc/apt/trusted.gpg.d/scribus-ppa.gpg --keyring /etc/apt/trusted.gpg.d/sunab-kdenlive-release.gpg --keyring /etc/apt/trusted.gpg.d/vovansrnd-coolreader.gpg --keyring /etc/apt/trusted.gpg.d/xubuntu-dev-xfce-4_12.gpg --recv-keys --keyserver keyserver.ubuntu.com B7B9C16F2667CA5C\r\ngpg: Schlüssel 2667CA5C von hkp-Server keyserver.ubuntu.com anfordern\r\ngpg: Schlüssel 2667CA5C: Öffentlicher Schlüssel "Daniel Folkinshteyn (Ubuntuzilla signing key) <nanotube@users.sourceforge.net>" importiert\r\ngpg: Anzahl insgesamt bearbeiteter Schlüssel: 1\r\ngpg: importiert: 1 (RSA: 1)\r\n