I've seen this error several times:
http://d-jenkins.ubuntu-ci:8080/job/wily-adt-virtualbox/19/ARCH=amd64,label=adt/console
http://d-jenkins.ubuntu-ci:8080/job/wily-adt-ubuntu-drivers-common/13/ARCH=amd64,label=adt/console
Building remotely on adt-nova in workspace /var/lib/jenkins/slaves/adt-nova/workspace/wily-adt-virtualbox/ARCH/amd64/label/adt
[adt] $ /bin/bash /tmp/hudson3876332937517824566.sh
E: Posting request to cloud service failed: {
"detail": "Data from image-mapper is: b'<html>\\n <head>\\n <title>Internal Server Error</title>\\n </head>\\n <body>\\n <h1><p>Internal Server Error</p></h1>\\n \\n </body>\\n</html>\\n'",
"message": "Error while decoding image-mapper response: Expecting value: line 1 column 1 (char 0)"
}
Build step 'Execute shell' marked build as failure
Retrying doesn't help, it keeps failing..