The installer needs to commit changes to partition tables, but cannot do so because partitions on the following mount points could not be unmounted:

/cdrom

Please close any applications using these mount points.

Would you like the installer to try to unmount these partitions again?

/usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py:17: Warning: Source ID 12218 was not found when attempting to remove it

GLib.source_remove(self.timeout_id)

/usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py:133: Warning: Source ID 12450 was not found when attempting to remove it

GLib.source_remove(self.rows_changed_id)