I have the same problem.  Running a freshly installed Ubuntu 14.04 LTS, no 
java package installed.  I've followed the installation instructions at 
http://pkg.jenkins-ci.org/debian-stable/ exactly.  I end up with the same 
results:

Processing triggers for libc-bin (2.19-0ubuntu6.9) ...
       Processing triggers for ureadahead (0.100.0-16) ...
       Processing triggers for ca-certificates (20160104ubuntu0.14.04.1) ...
       Updating certificates in /etc/ssl/certs... 0 added, 0 removed; done.
       Running hooks in /etc/ca-certificates/update.d....
       done.
       done.
       STDERR: invoke-rc.d: initscript jenkins, action "start" failed.
       dpkg: error processing package jenkins (--configure):
        subprocess installed post-installation script returned error exit 
status 7
       Errors were encountered while processing:
        jenkins
       E: Sub-process /usr/bin/dpkg returned an error code (1)


There was no previously installed Jenkins on this vm.  If I login to the 
box and run 'apt-get install jenkins' a 2nd time, Jenkins starts and all is 
well.  The install automatically pulls in all of the dependencies as it 
should, including openJDK:

root@default-ubuntu-1404:~# java -version
java version "1.7.0_111"
OpenJDK Runtime Environment (IcedTea 2.6.7) (7u111-2.6.7-0ubuntu0.14.04.3)
OpenJDK 64-Bit Server VM (build 24.111-b01, mixed mode)




Using the stable or the LTS repo has the same result.

Brad


On Thursday, August 25, 2016 at 5:21:56 AM UTC-7, Mark Waite wrote:

> If you had Jenkins installed previously on that computer, check that 
> /etc/default/jenkins is setting the value of RUN_STANDALONE=true.  I 
> believe that the Jenkins installer for Ubuntu (and Debian) wants to start 
> the Jenkins server, and it won't start the Jenkins server if 
> RUN_STANDALONE=false.
>
> Mark Waite
>
> On Thu, Aug 25, 2016 at 6:19 AM Mark Waite <[email protected] 
> <javascript:>> wrote:
>
>> Use "java -version" to check that the java installation is at least Java 
>> 7.  The latest Jenkins requires at least Java 7.
>>
>> Check that openjdk or Oracle Java are the java implementations, rather 
>> than gcj.  Jenkins does not run with gcj as the java implementation.
>>
>> Ubuntu 12.04 is an older Linux release, nearing the end of its vendor 
>> provided support life (April 2017 will end support for it).  You might 
>> perform a test installation on a different computer running a newer Ubuntu 
>> version (like 14.04 or 16.04).
>>
>> Mark Waite
>>
>> On Thu, Aug 25, 2016 at 5:41 AM Shivaji Patne <[email protected] 
>> <javascript:>> wrote:
>>
>>> how could i solve this problem ..while installing jenkins on mu 
>>> ubuntu12.04
>>>
>>>
>>> Setting up jenkins (2.19) ...
>>>  * Starting Jenkins Continuous Integration Server jenkins               
>>>  [fail] 
>>> invoke-rc.d: initscript jenkins, action "start" failed.
>>> dpkg: error processing jenkins (--configure):
>>>  subprocess installed post-installation script returned error exit 
>>> status 7
>>> Errors were encountered while processing:
>>>  jenkins
>>> E: Sub-process /usr/bin/dpkg returned an error code (1)
>>>
>>>
>>>
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