ubuntuone-login crashed with ImportError in __main__: No module named linux

I'm using nightly builds of Ubuntu One. It crashes when I open the client. Here you are the log file:

2012-06-16 19:13:59,567 - ubuntuone.SyncDaemon.Main - INFO - Starting Ubuntu One client version 4.1
2012-06-16 19:13:59,567 - ubuntuone.SyncDaemon.Main - INFO - Using '/home/bal/Ubuntu One' as root dir
2012-06-16 19:13:59,567 - ubuntuone.SyncDaemon.Main - INFO - Using '/home/bal/.local/share/ubuntuone/syncdaemon' as data dir
2012-06-16 19:13:59,567 - ubuntuone.SyncDaemon.Main - INFO - Using '/home/bal/.local/share/ubuntuone/shares' as shares root dir
2012-06-16 19:13:59,568 - ubuntuone.SyncDaemon.tritcask - INFO - Initializing Tritcask on: /home/bal/.local/share/ubuntuone/syncdaemon/tritcask
2012-06-16 19:13:59,568 - ubuntuone.SyncDaemon.tritcask - DEBUG - lookingup data files
2012-06-16 19:13:59,568 - ubuntuone.SyncDaemon.tritcask - INFO - found 2 data files, 0 dead and 0 broken files
2012-06-16 19:13:59,568 - ubuntuone.SyncDaemon.tritcask - DEBUG - building the keydir, using: [u'1339862412039857', u'1339862412329184']
2012-06-16 19:13:59,568 - ubuntuone.SyncDaemon.tritcask - DEBUG - loading entries from hint of: /home/bal/.local/share/ubuntuone/syncdaemon/tritcask/1339862412039857.inactive.tritcask-v1.data
2012-06-16 19:13:59,569 - ubuntuone.SyncDaemon.tritcask - DEBUG - Ignoring empty live file.
2012-06-16 19:13:59,569 - ubuntuone.SyncDaemon.tritcask - INFO - keydir ready! (keys: 2)
2012-06-16 19:13:59,569 - ubuntuone.SyncDaemon.VM.MD - DEBUG - metadata version: 7
2012-06-16 19:13:59,570 - ubuntuone.SyncDaemon.fsm - INFO - loading updated metadata
2012-06-16 19:13:59,570 - ubuntuone.SyncDaemon.fsm - INFO - initialized: idx_path: 1, idx_node_id: 1, shares: 1
2012-06-16 19:13:59,580 - ubuntuone.SyncDaemon.filesystem_notifications.GeneralProcessor - INFO - Ignoring files: ['\\A#.*\\Z', '\\A.*~\\Z', '\\A.*\\.py[oc]\\Z', '\\A.*\\.sw[nopx]\\Z', '\\A.*\\.swpx\\Z', '\\A\\..*\\.tmp\\Z', '\\A\\.~lock\\..*#\\Z', '\\A\\.goutputstream-.*\\Z']
2012-06-16 19:13:59,592 - ubuntuone.SyncDaemon.VM - DEBUG - init_root
2012-06-16 19:13:59,592 - ubuntuone.SyncDaemon.VM - DEBUG - adding inotify watch to: /home/bal/Ubuntu One
2012-06-16 19:13:59,593 - ubuntuone.SyncDaemon.FSMonitor - DEBUG - Adding general inotify watch to '/home/bal/Ubuntu One'
2012-06-16 19:13:59,594 - ubuntuone.SyncDaemon.OffloadQueue - DEBUG - Using temporary file: '/tmp/tmpmNNIvO'
2012-06-16 19:13:59,594 - ubuntuone.SyncDaemon.TunnelRunner - INFO - Proxy support not installed.
2012-06-16 19:13:59,596 - ubuntuone.SyncDaemon.HQ - INFO - HashQueue: _hasher started
2012-06-16 19:13:59,596 - ubuntuone.SyncDaemon.QueueManager - DEBUG - start
2012-06-16 19:13:59,596 - ubuntuone.SyncDaemon.ConnectionManager - DEBUG - start
2012-06-16 19:13:59,597 - ubuntuone.SyncDaemon.StateManager - DEBUG - start
2012-06-16 19:14:00,556 - ubuntuone.SyncDaemon.DBus - DEBUG - using the real session bus
2012-06-16 19:14:00,556 - ubuntuone.SyncDaemon.DBus - DEBUG - using the real system bus
2012-06-16 19:14:00,557 - ubuntuone.SyncDaemon.DBus - INFO - DBusInterface initialized.
2012-06-16 19:14:00,558 - ubuntuone.SyncDaemon.InteractionInterfaces - INFO - connect: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonService object at 0x955678c>,), kwargs {'autoconnecting': True}.
2012-06-16 19:14:00,558 - ubuntuone.SyncDaemon.InteractionInterfaces - INFO - connect: result <generator object connect at 0x9558edc>.
2012-06-16 19:14:00,615 - ubuntuone.SyncDaemon.Main - NOTE - ---- MARK (state: <State: 'INIT' (queues IDLE connection 'Not User Not Network')>; queue: 0; offloaded: 0; hash: 0) ----
2012-06-16 19:14:00,616 - ubuntuone.SyncDaemon.EQ - DEBUG - push_event: SYS_INIT_DONE, kwargs: {}
2012-06-16 19:14:00,616 - ubuntuone.SyncDaemon.StateManager - DEBUG - received event 'SYS_INIT_DONE'
2012-06-16 19:14:00,616 - ubuntuone.SyncDaemon.StateManager - DEBUG - Transition INIT --[SYS_INIT_DONE]--> LOCAL_RESCAN (queues: IDLE; connection: Not User Not Network)
2012-06-16 19:14:00,617 - ubuntuone.SyncDaemon.Main - NOTE - Local rescan starting...
2012-06-16 19:14:00,617 - ubuntuone.SyncDaemon.local_rescan - INFO - start scan all volumes
2012-06-16 19:14:00,617 - ubuntuone.SyncDaemon.local_rescan - INFO - processing trash
2012-06-16 19:14:00,617 - ubuntuone.SyncDaemon.local_rescan - INFO - processing move limbo
2012-06-16 19:14:00,618 - ubuntuone.SyncDaemon.local_rescan - DEBUG - process next in queue (len 1)
2012-06-16 19:14:00,618 - ubuntuone.SyncDaemon.EQ - DEBUG - push_event: SYS_STATE_CHANGED, kwargs: {'state': LOCAL_RESCAN (error=False connected=False online=False) Queue: IDLE Connection: Not User Not Network}
2012-06-16 19:14:00,618 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - handle_SYS_STATE_CHANGED: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonEventListener object at 0x9556b0c>,), kwargs {'state': LOCAL_RESCAN (error=False connected=False online=False) Queue: IDLE Connection: Not User Not Network}.
2012-06-16 19:14:00,622 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - handle_SYS_STATE_CHANGED: result None.
2012-06-16 19:14:00,625 - ubuntuone.SyncDaemon.InteractionInterfaces - INFO - start: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonService object at 0x955678c>,), kwargs {}.
2012-06-16 19:14:00,625 - ubuntuone.SyncDaemon.InteractionInterfaces - INFO - start: result <Deferred at 0x95c708c current result: None>.
2012-06-16 19:14:00,625 - ubuntuone.SyncDaemon - INFO - not starting twisted.manhole
2012-06-16 19:14:00,627 - ubuntuone.SyncDaemon.local_rescan - DEBUG - _scan_tree: share_path: '/home/bal/Ubuntu One' path: '/home/bal/Ubuntu One'
2012-06-16 19:14:00,627 - ubuntuone.SyncDaemon.local_rescan - DEBUG - Adding watch to '/home/bal/Ubuntu One'
2012-06-16 19:14:00,627 - ubuntuone.SyncDaemon.FSMonitor - DEBUG - Watch already there for '/home/bal/Ubuntu One'
2012-06-16 19:14:00,628 - ubuntuone.SyncDaemon.local_rescan - DEBUG - scanning the dir '/home/bal/Ubuntu One'
2012-06-16 19:14:00,631 - ubuntuone.SyncDaemon.local_rescan - INFO - Ignoring path as it's a symlink: '/home/bal/Ubuntu One/Shared With Me'
2012-06-16 19:14:00,632 - ubuntuone.SyncDaemon.local_rescan - DEBUG - comparing directory '/home/bal/Ubuntu One'
2012-06-16 19:14:00,632 - ubuntuone.SyncDaemon.local_rescan - DEBUG - checking root: '/home/bal/Ubuntu One' in NONE, ok!
2012-06-16 19:14:00,632 - ubuntuone.SyncDaemon.local_rescan - DEBUG - process next in queue (len 0)
2012-06-16 19:14:00,633 - ubuntuone.SyncDaemon.Main - NOTE - Local rescan finished!
2012-06-16 19:14:00,633 - ubuntuone.SyncDaemon.Main - INFO - hash queue empty. We are ready!
2012-06-16 19:14:00,633 - ubuntuone.SyncDaemon.EQ - DEBUG - push_event: SYS_LOCAL_RESCAN_DONE, kwargs: {}
2012-06-16 19:14:00,634 - ubuntuone.SyncDaemon.StateManager - DEBUG - received event 'SYS_LOCAL_RESCAN_DONE'
2012-06-16 19:14:00,634 - ubuntuone.SyncDaemon.StateManager - DEBUG - Transition LOCAL_RESCAN --[SYS_LOCAL_RESCAN_DONE]--> READY (queues: IDLE; connection: Not User Not Network)
2012-06-16 19:14:00,634 - ubuntuone.SyncDaemon.EQ - DEBUG - push_event: SYS_STATE_CHANGED, kwargs: {'state': READY (error=False connected=False online=False) Queue: IDLE Connection: Not User Not Network}
2012-06-16 19:14:00,634 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - handle_SYS_STATE_CHANGED: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonEventListener object at 0x9556b0c>,), kwargs {'state': READY (error=False connected=False online=False) Queue: IDLE Connection: Not User Not Network}.
2012-06-16 19:14:00,637 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - handle_SYS_STATE_CHANGED: result None.
2012-06-16 19:14:00,648 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_rootdir: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonService object at 0x955678c>,), kwargs {}.
2012-06-16 19:14:00,649 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_rootdir: result u'/home/bal/Ubuntu One'.
2012-06-16 19:14:00,651 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_folders: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonFolders object at 0x9556aac>,), kwargs {}.
2012-06-16 19:14:00,651 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_folders: result [].
2012-06-16 19:14:00,652 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - network_state_changed: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonService object at 0x955678c>, Network state (online)), kwargs {}.
2012-06-16 19:14:00,652 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - network_connected: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonService object at 0x955678c>,), kwargs {}.
2012-06-16 19:14:00,652 - ubuntuone.SyncDaemon.EQ - DEBUG - push_event: SYS_NET_CONNECTED, kwargs: {}
2012-06-16 19:14:00,652 - ubuntuone.SyncDaemon.StateManager - DEBUG - received event 'SYS_NET_CONNECTED'
2012-06-16 19:14:00,653 - ubuntuone.SyncDaemon.StateManager - DEBUG - sending event to ConnectionManager
2012-06-16 19:14:00,653 - ubuntuone.SyncDaemon.ConnectionManager - DEBUG - Internal transition 'Not User Not Network' -> 'Not User With Network'
2012-06-16 19:14:00,653 - ubuntuone.SyncDaemon.StateManager - DEBUG - ConnectionManager returned None
2012-06-16 19:14:00,653 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - network_connected: result None.
2012-06-16 19:14:00,653 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - network_state_changed: result None.
2012-06-16 19:14:00,666 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - current_status: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonStatus object at 0x9556a0c>,), kwargs {}.
2012-06-16 19:14:00,666 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - current_status: result {'is_error': '', 'name': 'READY', 'queues': 'IDLE', 'connection': 'Not User With Network', 'is_online': '', 'is_connected': '', 'description': 'ready to connect'}.
2012-06-16 19:14:00,667 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_folders: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonFolders object at 0x9556aac>,), kwargs {}.
2012-06-16 19:14:00,667 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_folders: result [].
2012-06-16 19:14:01,415 - ubuntuone.SyncDaemon.InteractionInterfaces - ERROR - failure while getting the token
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/syncdaemon/interaction_interfaces.py", line 1256, in connect
    autoconnecting=autoconnecting)
CredentialsError: org.freedesktop.DBus.Error.Spawn.ChildExited: Process /usr/lib/ubuntuone-client/ubuntuone-login exited with status 1
2012-06-16 19:14:01,416 - twisted - ERROR - Unhandled error in Deferred:
2012-06-16 19:14:01,418 - twisted - ERROR - Unhandled Error
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 391, in errback
    self._startRunCallbacks(fail)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 458, in _startRunCallbacks
    self._runCallbacks()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 545, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1095, in gotResult
    _inlineCallbacks(r, g, deferred)
--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1037, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/usr/lib/python2.7/dist-packages/twisted/python/failure.py", line 382, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/syncdaemon/interaction_interfaces.py", line 1259, in connect
    raise NoAccessToken(e)
ubuntuone.syncdaemon.interaction_interfaces.NoAccessToken: org.freedesktop.DBus.Error.Spawn.ChildExited: Process /usr/lib/ubuntuone-client/ubuntuone-login exited with status 1

2012-06-16 19:19:02,674 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_shared: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonShares object at 0x9556a6c>,), kwargs {}.
2012-06-16 19:19:02,674 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_shared: result [].
2012-06-16 19:19:03,755 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_metadata_and_quick_tree_synced: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonFileSystem object at 0x9556a4c>, '/home/bal/Ubuntu One'), kwargs {}.
2012-06-16 19:19:03,755 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_metadata_and_quick_tree_synced: result {'mdid': '697530fb-2c68-4698-89bd-4fc6416b19db', 'info_created': '1336603340.6', 'stat': 'posix.stat_result(st_mode=16893, st_ino=6294102L, st_dev=2049L, st_nlink=2, st_uid=1000, st_gid=1000, st_size=4096L, st_atime=1336603340, st_mtime=1336603340, st_ctime=1336603340)', 'share_id': '', 'generation': 'None', 'quick_tree_synced': 'synced', 'info_is_partial': 'False', 'local_hash': '', 'node_id': '8e080048-1cc0-473e-a0b1-b6bff2c7f4eb', 'info_node_id_assigned': '1336739671.29', 'crc32': 'None', 'path': '/home/bal/Ubuntu One', 'is_dir': 'True', 'size': 'None', 'server_hash': ''}.
2012-06-16 19:19:03,804 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_shares: args (<ubuntuone.syncdaemon.interaction_interfaces.SyncdaemonShares object at 0x9556a6c>,), kwargs {}.
2012-06-16 19:19:03,804 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - get_shares: result [].

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: ubuntuone-client 4.1+r1259-60~precise1 [origin: LP-PPA-ubuntuone-nightlies]
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic-pae 3.2.18
Uname: Linux 3.2.0-25-generic-pae i686
ApportVersion: 2.0.1-0ubuntu8
Architecture: i386
CrashCounter: 1
CrashDB: ubuntuone
Date: Sat Jun 16 19:01:36 2012
ExecutablePath: /usr/lib/ubuntuone-client/ubuntuone-login
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/lib/ubuntuone-client/ubuntuone-login
PythonArgs: ['/usr/lib/ubuntuone-client/ubuntuone-login']
SourcePackage: ubuntuone-client
ThirdParty: True
Title: ubuntuone-login crashed with ImportError in __main__: No module named linux
Traceback:
 Traceback (most recent call last):
   File "/usr/lib/ubuntuone-client/ubuntuone-login", line 47, in <module>
     from ubuntuone.platform.credentials.linux import (
 ImportError: No module named linux
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo