[Comm] Slomalsya UPDATE?

["ALT Linux User" <altlinux.mailbox@gmail.com>]

ALT Linux Compact 3.0 DVD Release

При попытке сделать update из apt-shell или напрямую apt-get update возвращает:

Get:1 ftp://updates.altlinux.ru i586 release [691B]
Err ftp://updates.altlinux.ru i586 release
  file was not signed with a known key. Check if the proper gpg key
was imported to your keyring.
Fetched 691B in 5s (137B/s)
Failed to fetch ftp://updates.altlinux.ru/3.0/i586/base/release  file
was not signed with a known key. Check if the proper gpg key was
imported to your keyring.
Reading Package Lists... Done
Building Dependency Tree... Done
W: Release files for some repositories could not be retrieved or
authenticated. Such repositories are being ignored.
W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old
ones used instead.

apt-get update возвращает тоже самое. Подскажите пожалуйста, что делать?