[mdk-re] apt-get

[Эсмонт]

При попытке обновить систему получаю отказ в виде:

Get:1 ftp://ftp.altlinux.ru i586/Mandrake/base/hashfile [602B]
Err ftp://ftp.altlinux.ru i586/Mandrake/base/hashfile
  file was not signed with a known key. Check if the proper gpg key was 
imported to your keyring.
Err ftp://ftp.altlinux.ru i586/Mandrake/base/hashfile
  file was not signed with a known key. Check if the proper gpg key was 
imported to your keyring.
Fetched 602B in 8s (73B/s)
 С чем это связано?