crashes on install

[Katy]

Binary package hint: ubiquity

May 25 14:41:49 root ubiquity[2361]: Exception in GTK frontend (invoking crash handler):
May 25 14:41:49 root ubiquity[2361]: Traceback (most recent call last):
May 25 14:41:49 root ubiquity[2361]: File "/usr/lib/ubiquity/bin/ubiquity", line 524, in <module>
May 25 14:41:49 root ubiquity[2361]: main(oem_config)
May 25 14:41:49 root ubiquity[2361]: File "/usr/lib/ubiquity/bin/ubiquity", line 511, in main
May 25 14:41:49 root ubiquity[2361]: install(query=options.query)
May 25 14:41:49 root ubiquity[2361]: File "/usr/lib/ubiquity/bin/ubiquity", line 242, in install
May 25 14:41:49 root ubiquity[2361]: ret = wizard.run()
May 25 14:41:49 root ubiquity[2361]: File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 513, in run
May 25 14:41:49 root ubiquity[2361]: self.process_step()
May 25 14:41:49 root ubiquity[2361]: File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 1179, in process_step
May 25 14:41:49 root ubiquity[2361]: self.progress_loop()
May 25 14:41:49 root ubiquity[2361]: File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 1062, in progress_loop
May 25 14:41:49 root ubiquity[2361]: (ret, realtb))
May 25 14:41:49 root ubiquity[2361]: RuntimeError: Install failed with exit code 1
May 25 14:41:49 root ubiquity[2361]: Traceback (most recent call last):
May 25 14:41:49 root ubiquity[2361]: File "/usr/share/ubiquity/install.py", line 2566, in <module>
May 25 14:41:49 root ubiquity[2361]: install.run()
May 25 14:41:49 root ubiquity[2361]: File "/usr/share/ubiquity/install.py", line 353, in run
May 25 14:41:49 root ubiquity[2361]: self.copy_all()
May 25 14:41:49 root ubiquity[2361]: File "/usr/share/ubiquity/install.py", line 685, in copy_all
May 25 14:41:49 root ubiquity[2361]: assert os.path.exists(fs_size), "Missing filesystem.size."
May 25 14:41:49 root ubiquity[2361]: AssertionError: Missing filesystem.size.