每次加入新的 套件庫(sources.list), ex:
# mplayer
deb http://www.debian-multimedia.org stable main
# skype
deb http://download.skype.com/linux/repos/debian/ stable non-free
#xbmc
deb http://ppa.launchpad.net/team-xbmc/jaunty-ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/team-xbmc/jaunty-ppa/ubuntu jaunty main
apt-get update, 就會出現 GPG error, 類似如下的訊息:
W: GPG error: ftp://www.hk.debian.org unstable Release:
The following signatures couldn't be verified
because the public key is not available:
NO_PUBKEY F1D53D8C4F368D5D NO_PUBKEY 010908312D230C5F
W: You may want to run apt-get update to correct these problems