Install on linux

sudo apt-get install python-qt4
bzr branch http://bazaar.launchpad.net/~qbzr-dev/qbzr/trunk ~/.bazaar/plugins/qbzr

I followed the instructions a year ago. But get an exception
bzr qlog
Error in sys.excepthook:
Traceback (most recent call last):
  File "/home/niels/.bazaar/plugins/qbzr/lib/trace.py", line 238, in excepthook
    type=ITEM_OR_EVENT_METHOD)
  File "/home/niels/.bazaar/plugins/qbzr/lib/trace.py", line 65, in report_exception
    from bzrlib.trace import report_exception, print_exception
ImportError: cannot import name print_exception

Original exception was:
Traceback (most recent call last):
  File "/home/niels/.bazaar/plugins/qbzr/lib/util.py", line 934, in decorate
    run_in_loading_queue(f, *args, **kargs)
  File "/home/niels/.bazaar/plugins/qbzr/lib/util.py", line 946, in run_in_loading_queue
    f(*args, **kargs)
  File "/home/niels/.bazaar/plugins/qbzr/lib/uifactory.py", line 31, in decorate
    r = f(*args, **kargs)
  File "/home/niels/.bazaar/plugins/qbzr/lib/trace.py", line 227, in reports_exception_decorate
    args[0].report_exception(type=type)
  File "/home/niels/.bazaar/plugins/qbzr/lib/util.py", line 262, in report_exception
    trace.report_exception(exc_info=exc_info, type=type, window=self.window())
  File "/home/niels/.bazaar/plugins/qbzr/lib/trace.py", line 65, in report_exception
    from bzrlib.trace import report_exception, print_exception
ImportError: cannot import name print_exception

I guess that the versions are incompatible. Unfortunately it's difficult to get another version because now I get
bzr: ERROR: Unknown branch format: 'Bazaar Branch Format 7 (needs bzr 1.6)\n'

In backports the bzr-tools packages doesn't exists, only bzr and bzr-doc, so it's difficult to upgrade.

2niels: What version of bzr you have?

Lenny uses 1.5.
I guess I must go to backports, take Version 2.0.3 and install all plugins into userspace.