Following the installation instructions for debian packages found here:
https://wiki.jenkins-ci.org/display/JENKINS/Installing+Jenkins+on+Ubuntu
is not successful. The installation process fails with this error:

Setting up default-jre-headless (2:1.7-52) ...
Setting up jenkins (2.7.3) ...
Job for jenkins.service failed. See 'systemctl status jenkins.service' and 'journalctl -xn' for details.
invoke-rc.d: initscript jenkins, action "start" failed.
dpkg: error processing package jenkins (--configure):
subprocess installed post-installation script returned error exit status 1
Processing triggers for ca-certificates (20141019+deb8u1) ...
Updating certificates in /etc/ssl/certs... 0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d....
done.
done.
Setting up openjdk-7-jre-headless:amd64 (7u111-2.6.7-1~deb8u1) ...
update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/rmid to provide /usr/bin/rmid (rmid) in auto mode
update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java to provide /usr/bin/java (java) in auto mode
update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/keytool to provide /usr/bin/keytool (keytool) in auto mode
update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/pack200 to provide /usr/bin/pack200 (pack200) in auto mode
update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/rmiregistry to provide /usr/bin/rmiregistry (rmiregistry) in auto mode
update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/unpack200 to provide /usr/bin/unpack200 (unpack200) in auto mode
update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/orbd to provide /usr/bin/orbd (orbd) in auto mode
update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/servertool to provide /usr/bin/servertool (servertool) in auto mode
update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/tnameserv to provide /usr/bin/tnameserv (tnameserv) in auto mode
update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/jexec to provide /usr/bin/jexec (jexec) in auto mode
Processing triggers for libc-bin (2.19-18+deb8u4) ...
Processing triggers for systemd (215-17+deb8u4) ...
Errors were encountered while processing:
jenkins
E: Sub-process /usr/bin/dpkg returned an error code (1)

Totally fresh vagrant debian/contrib-jessie64 image.
I do not understand why you do not test for successful installs before publishing.