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Originally created by @Anonymous on #11932 (Redmine)

This error does not prevent the ISO from being installed.

$ DEBUG=1 tails-installer-launcher 
2016-11-16 15:45:07,781 [creator.py:1338 (get_extlinux_version)] WARNING: extlinux not found! Only FAT filesystems will be supported
2016-11-16 15:45:07,803 [creator.py:625 (detect_supported_drives)] WARNING: Skipping device '/org/freedesktop/UDisks2/block_devices/sda5' connected to '' interface
2016-11-16 15:45:07,804 [creator.py:625 (detect_supported_drives)] WARNING: Skipping device '/org/freedesktop/UDisks2/block_devices/sda' connected to '' interface
2016-11-16 15:45:07,804 [creator.py:625 (detect_supported_drives)] WARNING: Skipping device '/org/freedesktop/UDisks2/block_devices/sda2' connected to '' interface
2016-11-16 15:45:07,804 [creator.py:625 (detect_supported_drives)] WARNING: Skipping device '/org/freedesktop/UDisks2/block_devices/sda1' connected to '' interface
Could not guess underlying block device: Argument 1 does not allow None as a value
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/dist-packages/tails_installer/gui.py", line 141, in run
    free = self.get_free_bytes()
  File "/usr/lib/python2.7/dist-packages/tails_installer/creator.py", line 1068, in get_free_bytes
    stat = os.statvfs(device)
OSError: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/media/u/Tails'

I used tails-installer version 4.4.11.