package language-selector-common 0.2.10 failed to install/upgrade: subprocess post-installation script returned error exit status 1

I was updating Hardy Heron and I got the following error:

Preparing to replace language-selector-common 0.2.10 (using .../language-selector-common_0.2.10_all.deb) ...
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 1593, in <module>
    main()
  File "/usr/bin/pycentral", line 1587, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 1145, in run
    pkg = DebPackage('package', self.args[0], oldstyle=False)
  File "/usr/bin/pycentral", line 295, in __init__
    self.read_pyfiles()
  File "/usr/bin/pycentral", line 315, in read_pyfiles
    lines = self.read_preinst_pkgconfig()
  File "/usr/bin/pycentral", line 403, in read_preinst_pkgconfig
    self.pkgconfig.readfp(cStringIO.StringIO(buffer.getvalue()))
AttributeError: 'NoneType' object has no attribute 'getvalue'
dpkg: warning - old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 1593, in <module>
    main()
  File "/usr/bin/pycentral", line 1587, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 1145, in run
    pkg = DebPackage('package', self.args[0], oldstyle=False)
  File "/usr/bin/pycentral", line 295, in __init__
    self.read_pyfiles()
  File "/usr/bin/pycentral", line 315, in read_pyfiles
    lines = self.read_preinst_pkgconfig()
  File "/usr/bin/pycentral", line 403, in read_preinst_pkgconfig
    self.pkgconfig.readfp(cStringIO.StringIO(buffer.getvalue()))
AttributeError: 'NoneType' object has no attribute 'getvalue'
dpkg: error processing /var/cache/apt/archives/language-selector-common_0.2.10_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 1593, in <module>
    main()
  File "/usr/bin/pycentral", line 1587, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 1015, in run
    pkg = DebPackage('package', self.args[0], oldstyle=False)
  File "/usr/bin/pycentral", line 295, in __init__
    self.read_pyfiles()
  File "/usr/bin/pycentral", line 315, in read_pyfiles
    lines = self.read_preinst_pkgconfig()
  File "/usr/bin/pycentral", line 403, in read_preinst_pkgconfig
    self.pkgconfig.readfp(cStringIO.StringIO(buffer.getvalue()))
AttributeError: 'NoneType' object has no attribute 'getvalue'
dpkg: error while cleaning up:
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/language-selector-common_0.2.10_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)