Build failed in Jenkins: quantal-server-amd64_default #3

[Jenkins Notification]

See <http://10.189.74.2:8080/job/quantal-server-amd64_default/3/>

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Started due to content change in http://cdimages.ubuntu.com/ubuntu-server/daily/current/SHA256SUMS
Building remotely on alderamin
[quantal-server-amd64_default] $ /bin/bash /tmp/hudson4191081458399993385.sh
INFO:root:Checking/Downloading current build for variant server from http://cdimage.ubuntu.com/ubuntu-server/daily
INFO:root:Remote file not available. Retrying in 15 minutes
INFO:root:Downloading ISO...

-------------------- 0.0%
####---------------- 20.1% 285.7 kBps 0:03 ETA  
#################### 100.0% 190.5 kBps DONE    

reading seed file ubuntu-server/quantal-server-amd64.iso: ********************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************
Read ubuntu-server/quantal-server-amd64.iso. Target 98.8% complete.      
downloading from http://cdimage.ubuntu.com//ubuntu-server/daily/current/quantal-server-amd64.iso:

###################- 98.8%
###################- 98.8% 30.2 kBps 5:07 ETA  
###################- 98.8% 330.1 kBps 0:25 ETA  
###################- 99.0% 1407.5 kBps 0:05 ETA  
###################- 99.6% 4489.7 kBps 0:00 ETA  
#################### 100.0% 1390.5 kBps DONE    

link: Operation not permitted
Unable to back up old file ubuntu-server/quantal-server-amd64.iso - completed download left in ubuntu-server/quantal-server-amd64.iso.part
verifying download...checksum matches OK
used 719163392 local, fetched 8861597
Syncing quantal ubuntu-server server amd64
Traceback (most recent call last):
  File "/usr/bin/dl-ubuntu-test-iso", line 628, in <module>
    main()
  File "/usr/bin/dl-ubuntu-test-iso", line 625, in main
    iso_download(wanted, config)
  File "/usr/bin/dl-ubuntu-test-iso", line 433, in iso_download
    if not (config.use_zsync and do_zsync(config, destination, uri, isoname)):
  File "/usr/bin/dl-ubuntu-test-iso", line 338, in do_zsync
    return _do_zsync(config, zsync_local, zsync_uri, zsync_iso)
  File "/usr/bin/dl-ubuntu-test-iso", line 313, in _do_zsync
    os.chmod(target, stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH)
OSError: [Errno 1] Operation not permitted: 'ubuntu-server/quantal-server-amd64.iso'
ERROR:root:Command '['dl-ubuntu-test-iso', '--variant=server', '--arch=amd64', '--release=quantal', '--build=current', '--isoroot=/var/lib/ubuntu-iso-testing/isos', '-P', '--flavor=ubuntu-server']' returned non-zero exit status 1
ERROR:root:Failed to download ISO. Aborting!
Build step 'Execute shell' marked build as failure
Archiving artifacts
Recording test results