[PLUG] apt-get errors

[Dirk Ouellette]

What do these errors from apt-get upgrade mean?
Thanks, Dirk

Do you want to continue? [Y/n] y
Checking GPG signatures...
error: automake15_1.5-6.2.9_noarch.rpm has invalid or unknown GPG key.
error: automake_1.6.3-5.2.9_noarch.rpm has invalid or unknown GPG key.
error: autoconf_2.57-3.2.9_noarch.rpm has invalid or unknown GPG key.
error: gtk+_1%3a1.2.10-25.2.9_i386.rpm has invalid or unknown GPG key.
error: gtk2_2.2.1-4.1.9_i386.rpm has invalid or unknown GPG key.
error: qt_1%3a3.1.2-2.0.9_i386.rpm has invalid or unknown GPG key.
error: automake14_1.4p6-5.3.9_noarch.rpm has invalid or unknown GPG key.
error: xmms-mp3_1%3a1.2.7-21.p_i386.rpm has invalid or unknown GPG key.
E: Sub-process /usr/bin/apt-sigchecker returned an error code (8)
E: Failure running script /usr/bin/apt-sigchecker