我正在使用 Ubuntu 12.10。当我尝试更新软件时，它显示了这个错误：
Requires installation of untrusted packages
This requires installing packages from unauthenticated sources.
Details
kalzium-data kanagram kate-data kde-l10n-engb kde-l10n-zhcn kde-runtime-data kdegames-data klettres-data libakonadi-kabc4 liblxc0 libwildmidi-config libwildmidi1 lxc marble-data nepomuk-core-data parley-data tomboy
updates ×1