Description of problem:
I chose fedora 18 gnome dvd as an source of instalation software. If I will somehow install this release of fedora it means this is my very lucky day and I have to go to buy a lottery ticket.
The following was filed automatically by anaconda:
anaconda 18.37.11 exception report
Traceback (most recent call first):
  File "/usr/lib64/python2.7/site-packages/pyanaconda/isys/__init__.py", line 153, in umount
    rc = _isys.umount(what)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/formats/fs.py", line 656, in unmount
    rc = isys.umount(self._mountpoint, removeDir = False)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/formats/fs.py", line 863, in teardown
    return self.unmount(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/devices.py", line 742, in _preTeardown
    self.format.teardown()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/devices.py", line 754, in teardown
    if not self._preTeardown(recursive=recursive):
  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/yumpayload.py", line 535, in _setUpMedia
    device.teardown(recursive=True)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/yumpayload.py", line 602, in _configureBaseRepo
    self._setUpMedia(isodevice)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/yumpayload.py", line 420, in updateBaseRepo
    self._configureBaseRepo(self.storage, checkmount=checkmount)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/source.py", line 556, in getRepoMetadata
    self.payload.updateBaseRepo(fallback=False, checkmount=False)
  File "/usr/lib64/python2.7/threading.py", line 504, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 91, in run
    threading.Thread.run(self, *args, **kwargs)
SystemError: (32, 'umount: /run/install/isodir: target is busy.\n        (In some cases useful info about processes that use\n         the device is found by lsof(8) or fuser(1))')

Additional info:
cmdline:        /usr/bin/python  /sbin/anaconda
cmdline_file:   initrd=initrd.img inst.stage2=hd:LABEL=Fedora\x2018\x20x86_64 quiet BOOT_IMAGE=vmlinuz 
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.6.10-4.fc18.x86_64
other involved packages: 
package:        anaconda-18.37.11
product:        Fedora
release:        Cannot get release name.
type:           libreport
version:        18