andreas@corrino:~/temp$ curl -sS -LOOJ http://releases.ubuntu.com/vivid/SHA256SUMS{,.gpg}
andreas@corrino:~/temp$ gpg --verify SHA256SUMS.gpg SHA256SUMS
gpg: Signature made tor 11 jun 2015 05:13:11 CEST using DSA key ID FBB75451
gpg: BAD signature from "Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>"
andreas@corrino:~/temp$ curl -sS -LOOJ http://releases.ubuntu.com/vivid/SHA1SUMS{,.gpg}
andreas@corrino:~/temp$ gpg --verify SHA1SUMS.gpg SHA1SUMS
gpg: Signature made tor 11 jun 2015 05:12:15 CEST using DSA key ID FBB75451
gpg: BAD signature from "Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>"
andreas@corrino:~/temp$ curl -sS -LOOJ http://releases.ubuntu.com/vivid/MD5SUMS{,.gpg}
andreas@corrino:~/temp$ gpg --verify MD5SUMS.gpg MD5SUMS
gpg: Signature made tor 11 jun 2015 05:11:08 CEST using DSA key ID FBB75451
gpg: BAD signature from "Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>"
andreas@corrino:~/temp$