installation failure probleme ubiquity

hello.

after first reboot the installation verification ends with the message: "the installation has failed log have been saved in ubuntuinstallation-log.zip and system will now reboot"
after this reboot the system ask to delete the root.disk and to retry and so on

the log: is:

Ubiquity 1.8.7
Apr 27 17:15:49 ubiquity: Starting up '['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/lib/ubiquity/localechooser/localechooser']' for ubiquity.components.language.Language
Apr 27 17:15:49 ubiquity: Watching for question patterns ^languagechooser/language-name, ^countrychooser/(shortlist|country-name)$
Apr 27 17:15:49 ubiquity: ['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/lib/ubiquity/localechooser/localechooser'] exited with code 0
Apr 27 17:15:52 ubiquity: Starting up '['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/share/ubiquity/tzsetup']' for ubiquity.components.timezone.Timezone
Apr 27 17:15:52 ubiquity: Watching for question patterns ^time/zone$
Apr 27 17:15:52 ubiquity: ['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/share/ubiquity/tzsetup'] exited with code 0
Apr 27 17:15:54 ubiquity: Starting up '['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/lib/ubiquity/console-setup/console-setup.postinst', 'configure']' for ubiquity.components.console_setup.ConsoleSetup
Apr 27 17:15:54 ubiquity: Watching for question patterns ^console-setup/layout, ^console-setup/variant
Apr 27 17:15:54 ubiquity: Setting keyboard layout: pc105 fr oss []
Apr 27 17:15:55 ubiquity: ['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/lib/ubiquity/console-setup/console-setup.postinst', 'configure'] exited with code 0
Apr 27 17:15:57 ubiquity: Starting up '['log-output', '-t', 'ubiquity', '--pass-stdout', '/bin/partman']' for ubiquity.components.partman.Partman
Apr 27 17:15:57 ubiquity: Watching for question patterns ^partman-auto/.*automatically_partition$, ^partman-auto/select_disk$, ^partman-partitioning/confirm_resize$, ^partman-partitioning/confirm_new_label$, ^partman-partitioning/new_size$, ^partman/choose_partition$, ^partman/confirm.*, ^partman/free_space$, ^partman/active_partition$, ^partman-partitioning/new_partition_(size|type|place)$, ^partman-target/choose_method$, ^partman-basicfilesystems/(fat_mountpoint|mountpoint|mountpoint_manual)$, ^partman/exception_handler$, ^partman/exception_handler_note$, type:boolean, ERROR, PROGRESS
Apr 27 17:15:58 ubiquity: Partman: update_partitions = None
Apr 27 17:15:58 ubiquity: Partman: update_partitions = None
Apr 27 17:15:58 ubiquity: Partman: update_partitions = None
Apr 27 17:15:59 ubiquity: Partman: update_partitions = None
Apr 27 17:15:59 ubiquity: Partman: update_partitions = None
Apr 27 17:15:59 ubiquity: Partman: update_partitions = None
Apr 27 17:16:00 ubiquity: Partman: update_partitions = None
Apr 27 17:16:05 ubiquity: ['log-output', '-t', 'ubiquity', '--pass-stdout', '/bin/partman'] exited with code 0
Apr 27 17:16:07 ubiquity: Starting up '['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/lib/ubiquity/user-setup/user-setup-ask', '/target']' for ubiquity.components.usersetup.UserSetup
Apr 27 17:16:07 ubiquity: Watching for question patterns ^passwd/user-fullname$, ^passwd/username$, ^passwd/user-password$, ^passwd/user-password-again$, ERROR
Apr 27 17:16:07 ubiquity: ['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/lib/ubiquity/user-setup/user-setup-ask', '/target'] exited with code 0
Apr 27 17:16:09 ubiquity: Starting up '['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/share/ubiquity/migration-assistant']' for ubiquity.components.migrationassistant.MigrationAssistant
Apr 27 17:16:09 ubiquity: Watching for question patterns ^migration-assistant/partitions, ^migration-assistant/.*/users$, ^migration-assistant/.*/items$, ^migration-assistant/.*/user$, ^migration-assistant/.*/password$, ^migration-assistant/failed-unmount, ^ubiquity/run-ma-again, ERROR
Apr 27 17:16:09 ubiquity: ['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/share/ubiquity/migration-assistant'] exited with code 0
/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py:1159: GtkWarning: gtk_progress_set_percentage: assertion `percentage >= 0 && percentage <= 1.0' failed
  self.progress_bar.set_fraction(fraction)
Apr 27 17:16:11 ubiquity: Starting up '['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/share/ubiquity/summary']' for ubiquity.components.summary.Summary
Apr 27 17:16:11 ubiquity: Watching for question patterns ^ubiquity/summary.*
Apr 27 17:16:11 ubiquity: ['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/share/ubiquity/summary'] exited with code 0
Apr 27 17:16:13 ubiquity: Starting up '['log-output', '-t', 'ubiquity', '--pass-stdout', '/bin/partman-commit']' for ubiquity.components.partman_commit.PartmanCommit
Apr 27 17:16:13 ubiquity: Watching for question patterns ^partman/confirm.*, type:boolean, ERROR, PROGRESS
Apr 27 17:16:48 ubiquity: ['log-output', '-t', 'ubiquity', '--pass-stdout', '/bin/partman-commit'] exited with code 0
Apr 27 17:16:49 ubiquity: Starting up '['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/share/ubiquity/install.py']' for ubiquity.components.install.Install
Apr 27 17:16:49 ubiquity: Watching for question patterns ^.*/apt-install-failed$, migration-assistant/failed-unmount, grub-installer/install_to_xfs, ubiquity/install/copying_error/md5, CAPB, ERROR, PROGRESS
Apr 27 17:23:07 ubiquity: ['log-output', '-t', 'ubiquity', '--pass-stdout', '/usr/share/ubiquity/install.py'] exited with code 1
Exception in GTK frontend (invoking crash handler):
Traceback (most recent call last):
  File "/usr/lib/ubiquity/bin/ubiquity", line 229, in <module>
    main()
  File "/usr/lib/ubiquity/bin/ubiquity", line 226, in main
    install()
  File "/usr/lib/ubiquity/bin/ubiquity", line 68, in install
    ret = wizard.run()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 428, in run
    self.progress_loop()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 797, in progress_loop
    (ret, realtb))
RuntimeError: Install failed with exit code 1
Traceback (most recent call last):
  File "/usr/share/ubiquity/install.py", line 1911, in <module>
    install.run()
  File "/usr/share/ubiquity/install.py", line 405, in run
    self.configure_ma()
  File "/usr/share/ubiquity/install.py", line 1101, in configure_ma
    raise InstallStepError("MigrationAssistantApply failed with code %d" % ret)
InstallStepError: MigrationAssistantApply failed with code 1

+ [ -e /host/ubuntu ]
+ zip -r /host/ubuntu/installation-logs.zip /var/log