In UbiquitySyslog.txt:

Jun 18 09:52:21 ubuntu plugininstall.py: Exception during installation:
Jun 18 09:52:21 ubuntu plugininstall.py: Traceback (most recent call last):
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 879, in do_install
Jun 18 09:52:21 ubuntu plugininstall.py:     fetchprogress, installprogress):
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 816, in commit_with_verify
Jun 18 09:52:21 ubuntu plugininstall.py:     res = cache.install_archives(pm, install_progress)
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/python3/dist-packages/apt/cache.py", line 444, in install_archives
Jun 18 09:52:21 ubuntu plugininstall.py:     res = install_progress.run(pm)
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 330, in run
Jun 18 09:52:21 ubuntu plugininstall.py:     child_pid = self.fork()
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/python3/dist-packages/apt/progress/base.py", line 210, in fork
Jun 18 09:52:21 ubuntu plugininstall.py:     return os.fork()
Jun 18 09:52:21 ubuntu plugininstall.py: OSError: [Errno 12] Cannot allocate memory
Jun 18 09:52:21 ubuntu plugininstall.py: 
Jun 18 09:52:21 ubuntu plugininstall.py: During handling of the above exception, another exception occurred:
Jun 18 09:52:21 ubuntu plugininstall.py: 
Jun 18 09:52:21 ubuntu plugininstall.py: Traceback (most recent call last):
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 56, in wrapper
Jun 18 09:52:21 ubuntu plugininstall.py:     func(self)
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 218, in run
Jun 18 09:52:21 ubuntu plugininstall.py:     self.install_restricted_extras()
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 1197, in install_restricted_extras
Jun 18 09:52:21 ubuntu plugininstall.py:     self.do_install(packages)
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 898, in do_install
Jun 18 09:52:21 ubuntu plugininstall.py:     chroot_cleanup(self.target)
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 179, in chroot_cleanup
Jun 18 09:52:21 ubuntu plugininstall.py:     chrex(target, 'umount', '/sys')
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 70, in chrex
Jun 18 09:52:21 ubuntu plugininstall.py:     return misc.execute('chroot', target, *args)
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/ubiquity/ubiquity/misc.py", line 494, in execute
Jun 18 09:52:21 ubuntu plugininstall.py:     status = subprocess.call(log_args)
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/python3.2/subprocess.py", line 471, in call
Jun 18 09:52:21 ubuntu plugininstall.py:     return Popen(*popenargs, **kwargs).wait()
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/python3.2/subprocess.py", line 745, in __init__
Jun 18 09:52:21 ubuntu plugininstall.py:     restore_signals, start_new_session)
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/python3.2/subprocess.py", line 1197, in _execute_child
Jun 18 09:52:21 ubuntu plugininstall.py:     restore_signals, start_new_session, preexec_fn)
Jun 18 09:52:21 ubuntu plugininstall.py: OSError: [Errno 12] Cannot allocate memory
Jun 18 09:52:21 ubuntu plugininstall.py: 
Jun 18 09:52:21 ubuntu plugininstall.py: During handling of the above exception, another exception occurred:
Jun 18 09:52:21 ubuntu plugininstall.py: 
Jun 18 09:52:21 ubuntu plugininstall.py: Traceback (most recent call last):
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 1687, in <module>
Jun 18 09:52:21 ubuntu plugininstall.py:     install.run()
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 58, in wrapper
Jun 18 09:52:21 ubuntu plugininstall.py:     self.cleanup()
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 1668, in cleanup
Jun 18 09:52:21 ubuntu plugininstall.py:     misc.execute('umount', self.target_file('cdrom'))
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/ubiquity/ubiquity/misc.py", line 494, in execute
Jun 18 09:52:21 ubuntu plugininstall.py:     status = subprocess.call(log_args)
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/python3.2/subprocess.py", line 471, in call
Jun 18 09:52:21 ubuntu plugininstall.py:     return Popen(*popenargs, **kwargs).wait()
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/python3.2/subprocess.py", line 745, in __init__
Jun 18 09:52:21 ubuntu plugininstall.py:     restore_signals, start_new_session)
Jun 18 09:52:21 ubuntu plugininstall.py:   File "/usr/lib/python3.2/subprocess.py", line 1197, in _execute_child
Jun 18 09:52:21 ubuntu plugininstall.py:     restore_signals, start_new_session, preexec_fn)
Jun 18 09:52:21 ubuntu plugininstall.py: OSError: [Errno 12] Cannot allocate memory
Jun 18 09:52:21 ubuntu plugininstall.py: 
Jun 18 09:53:03 ubuntu ubiquity: 
Jun 18 09:53:03 ubuntu ubiquity: ** (apport-gtk:29125): WARNING **: The connection is closed