سلام.وقتی می خوام آپدیت کنم. update manager این پیغام رو میده :
GPG error: http://debian.anonymous-proxy-servers.net karmic Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F5100840F1305880GPG error: http://packages.medibuntu.org karmic Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2EBC26B60C5A2783GPG error: http://ppa.launchpad.net karmic Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1E8EF721C49E6547GPG error: http://ppa.launchpad.net karmic Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6E871C4A881574DEGPG error: http://dl.google.com stable Release: The following signatures were invalid: NODATA 1 NODATA 2Failed to fetch http://dl.google.com/linux/deb/dists/stable/main/binary-i386/Packages.bz2 Sub-process /bin/bzip2 returned an error code (2)
Some index files failed to download, they have been ignored, or old ones used instead.
قبلا اینجوری نبود.باید چی کار کنم.؟