apt-get dist-upgrade schlägt fehl

Hallo alle zusammen, wenn ich als root mein System aktualisieren will mit "apt-get dist-upgrade" bekomme ich folgende Ausgabe:Die folgenden Pakete werden upgegradet werden: alsa-lib (1.0.3a-2 => 1.0.4-1.1.fc1.fr) alsa-lib-devel (1.0.3a-2 => 1.0.4-1.1.fc1.fr) alsa-utils (1.0.3-1 => 1.0.4-1.1.fc1.fr) apt (0.5.15cnc6-0.fdr.11.2 => 0.5.15cnc6-1.1.fc2.fr) dump (0.4b33-3 => 0.4b34-1) dvdrecord (0.1.4-5 => 0.1.5-1) flac (1.1.0-4 => 1.1.0-4.fr) grip (3.0.7-4 => 3.2.0-2.1.fc2.fr) gthumb (2.3.2-2 => 2.3.3-1.1.fc2.fr) libdv (0.102-1 => 0.102-1.1.fc1.fr) rhythmbox (0.8.3-3 => 0.8.4-1.1.fc2.fr) rmt (0.4b33-3 => 0.4b34-1) vcdimager (0.7.14-1.1.fc2.fr => 0.7.14-2.fr) yum (2.0.7-1.1 => 2.0.7-2.fc.fr) Die folgenden Pakete werden ERSETZT: pcmcia-cs (3.2.7-1.5) (by () kernel-pcmcia-cs) (3.2.7-1.5) Die folgenden NEUEN Pakete werden installiert werden: alsa-driver (1.0.4-1) id3lib (3.8.3-6.1.fc2.fr) kernel-pcmcia-cs (3.1.31-16) 14 upgraded, 3 newly installed, 1 ersetzt, 0 entfernt und 0 nicht upgegradet. Muss 0B/9925kB an Archiven holen. Nach dem Auspacken werden 5609kB zusätzlicher Plattenplatz benutzt werden. Wollen Sie fortsetzen? [J/n] J Checking GPG signatures... Unknown signature /var/cache/apt/archives/alsa-driver_1.0.4-1_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/alsa-lib-devel_1.0.4-1.1.fc1.fr_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/alsa-lib_1.0.4-1.1.fc1.fr_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/apt_0.5.15cnc6-1.1.fc2.fr_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/flac_1.1.0-4.fr_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/gthumb_2.3.3-1.1.fc2.fr_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/id3lib_3.8.3-6.1.fc2.fr_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/libdv_0.102-1.1.fc1.fr_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/rhythmbox_0.8.4-1.1.fc2.fr_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/yum_2.0.7-2.fc.fr_noarch.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/alsa-utils_1.0.4-1.1.fc1.fr_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/grip_1%3a3.2.0-2.1.fc2.fr_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) Unknown signature /var/cache/apt/archives/vcdimager_0.7.14-2.fr_i386.rpm: (SHA1) DSA sha1 md5 (GPG) NOT OK (MISSING KEYS: GPG#e42d547b) E: Error(s) while checking package signatures: 0 unsigned package(s) 13 package(s) with unknown signatures 0 package(s) with illegal/corrupted signatures Kann mir bitte einer sagen, woran das liegt, bzw. wie ich diese "Missing keys" "finden" kann??? Das ist plötzlich passiert, hatte vorher keine Probleme mit apt-get was zu installieren... Gruß Cedric Laczny