Comment 2 for bug 739873

Probably the same issue:

no_label, and yes_label arguments of yesno cause

File "/usr/lib/pymodules/python2.7/dialog.py", line 1571, in yesno
    **kwargs)[0]
  File "/usr/lib/pymodules/python2.7/dialog.py", line 825, in _perform
    child_rfd)
  File "/usr/lib/pymodules/python2.7/dialog.py", line 765, in _wait_for_program_termination
    "perhaps the dialog-like program could not be executed; "
dialog.PythonDialogErrorBeforeExecInChildProcess: <PythonDialogErrorBeforeExecInChildProcess: perhaps the dialog-like program could not be executed; perhaps the system is out of memory; perhaps the maximum number of open file descriptors has been reached>

Workaround:

Replaced python-dialog 2.7 with 2.11 from http://people.via.ecp.fr/~flo/index.en.xhtml

removed problem.

DistroRelease: Ubuntu 12.04
Package: python-dialog 2.7-1
Uname: Linux 3.2.0-41-generic-pae i686 athlon i386
Architecture: i386