How to forcefully move ahead in case installation of Red Hat Enterprise Linux fails with error "vgdeactivate failed for <volgroup_name>" ?

Issue

• While kickstart installation, the following traceback appears causing installation failure.

  Truncated backtrace:
  Traceback (most recent call last):
    File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 227, in run
      threading.Thread.run(self, *args, **kwargs)
    File "/usr/lib64/python2.7/threading.py", line 765, in run
      self.__target(*self.__args, **self.__kwargs)
    File "/usr/lib64/python2.7/site-packages/pyanaconda/install.py", line 204, in doInstall
      turnOnFilesystems(storage, mountOnly=flags.flags.dirInstall, callbacks=callbacks_reg)
    File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 230, in turnOnFilesystems
      storage.doIt(callbacks)
    File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 380, in doIt
      self.devicetree.processActions(callbacks)
    File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 373, in processActions
      action.execute(callbacks)
    File "/usr/lib/python2.7/site-packages/blivet/deviceaction.py", line 344, in execute
      self.device.destroy()
    File "/usr/lib/python2.7/site-packages/blivet/devices/storage.py", line 524, in destroy
      self._preDestroy()
    File "/usr/lib/python2.7/site-packages/blivet/devices/lvm.py", line 220, in _preDestroy
      StorageDevice._preDestroy(self)
    File "/usr/lib/python2.7/site-packages/blivet/devices/storage.py", line 515, in _preDestroy
      self.teardown()
    File "/usr/lib/python2.7/site-packages/blivet/devices/storage.py", line 459, in teardown
      self._teardown(recursive=recursive)
    File "/usr/lib/python2.7/site-packages/blivet/devices/lvm.py", line 207, in _teardown
      lvm.vgdeactivate(self.name)
    File "/usr/lib/python2.7/site-packages/blivet/devicelibs/lvm.py", line 401, in vgdeactivate
      raise LVMError("vgdeactivate failed for %s: %s" % (vg_name, msg))
  LVMError: vgdeactivate failed for vg_name: running /sbin/lvm vgchange -a n vg_name --config  devices { preferred_names=["^/dev/mapper/", "^/dev/md/", "^/dev/sd"] }  failed
  

• The disks are supposed to get cleared out completely and a fresh installation is required.