[Comm] Проблемы с apt-get update

["Овечкин Влад" <test@rrnn.ru>]

Добрый день всем. Пытаюсь выполнить apt-get update на машинке - полгода где 
то её не трогал. Получаю ошибку с ключами  - подскажите где исправить? 
Сравнил с аналогичной машинкой - вроде всё одинаково настроено, а не пашет:(
# apt-get update
Получено: 1 ftp://updates.altlinux.com Master/2.2/i586 release [696B]
Получено: 2 ftp://ftp.altlinux.com i586 release [2935B]
Ошибка ftp://updates.altlinux.com Master/2.2/i586 release
  file was not signed with a known key. Check if the proper gpg key was 
imported to your keyring.
Получено: 3 ftp://ftp.altlinux.com i686 release [2790B]
Ошибка ftp://ftp.altlinux.com i586 release
  file was not signed with a known key. Check if the proper gpg key was 
imported to your keyring.
Ошибка ftp://ftp.altlinux.com i686 release
  file was not signed with a known key. Check if the proper gpg key was 
imported to your keyring.
Получено 6421B за 0s (15,2kB/s).
Невозможно получить 
ftp://ftp.altlinux.com/pub/distributions/ALTLinux/Sisyphus/i586/base/release 
file was not signed with a known key. Check if the proper gpg key was 
imported to your keyring.
Невозможно получить 
ftp://ftp.altlinux.com/pub/distributions/ALTLinux/Sisyphus/i686/base/release 
file was not signed with a known key. Check if the proper gpg key was 
imported to your keyring.
Невозможно получить ftp://updates.altlinux.com/Master/2.2/i586/base/release 
file was not signed with a known key. Check if the proper gpg key was 
imported to your keyring.
С уважением,
Овечкин Влад.