Attempt to branch lp URL returns "Bazaar repository format 2a (needs bzr 1.16 or later)"

Binary package hint: bzr

Running on Ubuntu 9.04 Jaunty with up to date bzr package (1.13.1-1)

This command

  bzr branch lp:~zulcss/ec2-init/ec2-init-config

generates the following output:

--------------------------------------------------------------------------------
bzr: ERROR: exceptions.KeyError: 'Bazaar repository format 2a (needs bzr 1.16 or later)\n'

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 716, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 911, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 547, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.6/dist-packages/bzrlib/builtins.py", line 1100, in run
    source_branch=br_from)
  File "/usr/lib/python2.6/dist-packages/bzrlib/bzrdir.py", line 1098, in sprout
    cloning_format = self.cloning_metadir(stacked)
  File "/usr/lib/python2.6/dist-packages/bzrlib/remote.py", line 165, in cloning_metadir
    repo_name)
  File "/usr/lib/python2.6/dist-packages/bzrlib/registry.py", line 255, in get
    r = Registry.get(self, format_string)
  File "/usr/lib/python2.6/dist-packages/bzrlib/registry.py", line 168, in get
    return self._dict[self._get_key_or_default(key)].get_obj()
KeyError: 'Bazaar repository format 2a (needs bzr 1.16 or later)\n'

bzr 1.13.1 on python 2.6.2 (linux2)
arguments: ['/usr/bin/bzr', 'branch', 'lp:~zulcss/ec2-init/ec2-init-config']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'
plugins:
  builddeb /usr/lib/python2.6/dist-packages/bzrlib/plugins/builddeb [unknown]
  bzrtools /usr/lib/python2.6/dist-packages/bzrlib/plugins/bzrtools [1.13]
  etckeeper /usr/lib/python2.6/dist-packages/bzrlib/plugins/etckeeper [unknown]
  launchpad /usr/lib/python2.6/dist-packages/bzrlib/plugins/launchpad [unknown]
  netrc_credential_store /usr/lib/python2.6/dist-packages/bzrlib/plugins/netrc_credential_store [unknown]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.
--------------------------------------------------------------------------------

1. I think I should be allowed to look at Launchpad branches with Jaunty's bzr.

2. The stack dump is not a pleasant experience if "Bazaar repository format 2a (needs bzr 1.16 or later)" is the simple, real error.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
NonfreeKernelModules: nvidia wl
Package: bzr 1.13.1-1
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: bzr
Uname: Linux 2.6.28-17-server i686