Comment 7 for bug 562496

I guess it does work:

root@nsn2:~# rm -rf .gnupg
root@nsn2:~# gpg --keyring /etc/apt/trusted.gpg --trustdb /etc/apt/trustdb.gpg --no-default-keyring --status-fd 1 --no-secmem-warning --batch --verify Release.gpg Release
gpg: Signature made Tue 13 Apr 2010 09:25:39 AM BRT using DSA key ID 437D05B5
[GNUPG:] SIG_ID mIKaw5+pk677fzgzZBFIUb9ehSs 2010-04-13 1271161539
[GNUPG:] GOODSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>
gpg: Good signature from "Ubuntu Archive Automatic Signing Key <email address hidden>"
[GNUPG:] VALIDSIG 630239CC130E1A7FD81A27B140976EAF437D05B5 2010-04-13 1271161539 0 3 0 17 2 00 630239CC130E1A7FD81A27B140976EAF437D05B5
[GNUPG:] TRUST_UNDEFINED
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: 6302 39CC 130E 1A7F D81A 27B1 4097 6EAF 437D 05B5
root@nsn2:~# ls -la .gnupg
ls: cannot access .gnupg: No such file or directory
root@nsn2:~#