Downloading http://mirror.yandex.ru/debian-backports/dists/squeeze-backports/InRelease...
gpgv: keyblock resource `${HOME}/.gnupg/aptlytest.gpg': file open error
gpgv:  RSA key ID 46925553
gpgv: Can't check signature: public key not found
Downloading http://mirror.yandex.ru/debian-backports/dists/squeeze-backports/Release...
Downloading http://mirror.yandex.ru/debian-backports/dists/squeeze-backports/Release.gpg...
gpgv: keyblock resource `${HOME}/.gnupg/aptlytest.gpg': file open error
gpgv:  RSA key ID 46925553
gpgv: Can't check signature: public key not found
ERROR: unable to fetch mirror: verification of detached signature failed: exit status 2