Comment 0 for bug 151299

I was following the instructions on ServerUpgrade, and during the download of packages, my internet connection went down. After it was back up, I tried to re-run 'do-release-upgrade -d' and have the following error:

Checking for a new ubuntu release
Failed Upgrade tool signature
Failed Upgrade tool
Done downloading
extracting '/tmp/tmpIqSV8h/gutsy.tar.gz'
Traceback (most recent call last):
  File "/usr/bin/do-release-upgrade", line 45, in <module>
    fetcher.run()
  File "/usr/lib/python2.5/site-packages/UpdateManager/Core/DistUpgradeFetcherCore.py", line 160, in run
    if not self.extractDistUpgrader():
  File "/usr/lib/python2.5/site-packages/UpdateManager/Core/DistUpgradeFetcherCore.py", line 98, in extractDistUpgrader
    tar = tarfile.open(self.tmpdir+"/"+os.path.basename(self.uri),"r")
  File "/usr/lib/python2.5/tarfile.py", line 1139, in open
    return func(name, "r", fileobj)
  File "/usr/lib/python2.5/tarfile.py", line 1200, in gzopen
    fileobj = file(name, mode + "b")
IOError: [Errno 2] No such file or directory: '/tmp/tmpIqSV8h/gutsy.tar.gz'

There is no clear way on how to recover from this state.