Downloading http://mirror.yandex.ru/debian/dists/squeeze/InRelease...
Downloading http://mirror.yandex.ru/debian/dists/squeeze/Release...
Downloading http://mirror.yandex.ru/debian/dists/squeeze/Release.gpg...
gpgv: keyblock resource `${HOME}/.gnupg/aptlytest.gpg': file open error
gpgv:  RSA key ID 473041FA
gpgv: Can't check signature: public key not found
gpgv:  RSA key ID B98321F9
gpgv: Can't check signature: public key not found
ERROR: unable to fetch mirror: verification of detached signature failed: exit status 2