Public bug reported:

When I try do do an upgrade from Feisty to Gutsy Beta I get this
problem:

$ sudo update-manager -d
warning: could not initiate dbus
extracting '/tmp/tmphZoGYI/gutsy.tar.gz'
Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/UpdateManager/UpdateManager.py", line 
914, in on_button_dist_upgrade_clicked
    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 99, in extractDistUpgrader
    for tarinfo in tar:
  File "/usr/lib/python2.5/tarfile.py", line 2056, in next
    tarinfo = self.tarfile.next()
  File "/usr/lib/python2.5/tarfile.py", line 1809, in next
    self.fileobj.seek(self.offset)
  File "/usr/lib/python2.5/gzip.py", line 388, in seek
    self.read(1024)
  File "/usr/lib/python2.5/gzip.py", line 227, in read
    self._read(readsize)
  File "/usr/lib/python2.5/gzip.py", line 275, in _read
    self._read_eof()
  File "/usr/lib/python2.5/gzip.py", line 311, in _read_eof
    raise IOError, "CRC check failed"
IOError: CRC check failed

The update-manager application is still opened and I can retry my
upgrade. After doing that a couple of times I got past the initial
download and the Distribution Upgrade window appeared. I then got
another error when it was downloading files:

Failed to fetch http://archive.ubuntu.com/ubuntu/dists/feisty-
backports/main/binary-i386/Packages.gz Sub-process gzip returned an
error code (1)

This however was solved by disabling Automatix2 (and all other non-
default) repos in /etc/apt/sources.list.

I can reproduce this problem almost every time I try.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

-- 
update-manager crashes when upgrading from feisty to gutsy beta
https://bugs.launchpad.net/bugs/146204
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