[Comm] apt-get update (file was not signed with a known key. Check if the proper gpg key was imported to your keyring.)

[Vasiliy Safon <altdistrib@mail.ru>]

Народ помогите настроить sources.list на М2.4 в соответствие с
требованиями сегодняшних дней.
Что бы по возможности без ошибок шли процессы update и upgrade.
# Sisyphus
rpm cdrom:[ALT Linux 3.0.1 DVD (caprifoil)]/ ALTLinux base 
contrib main
rpm [alt]
ftp://ftp.altlinux.com/pub/distributions/ALTLinux/Sisyphus/i586 
classic
rpm [alt] 
ftp://ftp.altlinux.com/pub/distributions/ALTLinux/Sisyphus/
i586 base kernel castle junior master contrib non-free
rpm [alt]
ftp://ftp.altlinux.com/pub/distributions/ALTLinux/Master/2.4/ 
ALTLinux
main contrib

Это мои раскоментированные строки.
И вот вывод системы на #apt-get update
Get:1 ftp://updates.altlinux.com Master/2.4/i586 release [703B]
Get:2 ftp://ftp.altlinux.com i586 release [721B] Err
ftp://updates.altlinux.com Master/2.4/i586 release
 file was not signed with a known key. Check if the proper 
gpg key was
imported to your keyring.
Err 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.
Get:3 ftp://ftp.ibiblio.org i586 release Err 
ftp://ftp.ibiblio.org i586
release
 Unable to fetch file, server said
'/pub/Linux/distributions/altlinux/Sisyphus/i586/base/release: 
No such
file or directory  '
Fetched 1424B in 2s (593B/s)
Failed to fetch
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.
Failed to fetch 
ftp://updates.altlinux.com/Master/2.4/i586/base/release
file was not signed with a known key. Check if the proper 
gpg key was
imported to your keyring.
Failed to fetch
ftp://ftp.ibiblio.org/pub/Linux/distributions/altlinux/Sisyphus/i586/base/release
Unable to fetch file, server said
'/pub/Linux/distributions/altlinux/Sisyphus/i586/base/release: 
No such
file or directory  '
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.

Рад буду получить любую помощь