Preparing to replace scons 0.96.93-1 (using .../scons_0.96.93-2_all.deb) ...
INFO: using old version '/usr/bin/python2.3'
INFO: using unsupported version '/usr/bin/python2.5'
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 1367, in ?
    main()
  File "/usr/bin/pycentral", line 1361, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 946, in run
    pkg.remove(runtimes, remove_script_files=True)
  File "/usr/bin/pycentral", line 696, in remove
    default_runtime.remove_byte_code(self.private_files)
AttributeError: 'NoneType' object has no attribute 'remove_byte_code'
dpkg: warning - old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
INFO: using old version '/usr/bin/python2.3'
INFO: using unsupported version '/usr/bin/python2.5'
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 1367, in ?
    main()
  File "/usr/bin/pycentral", line 1361, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 946, in run
    pkg.remove(runtimes, remove_script_files=True)
  File "/usr/bin/pycentral", line 696, in remove
    default_runtime.remove_byte_code(self.private_files)
AttributeError: 'NoneType' object has no attribute 'remove_byte_code'
dpkg: error processing /var/cache/apt/archives/scons_0.96.93-2_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
INFO: using old version '/usr/bin/python2.3'
INFO: using unsupported version '/usr/bin/python2.5'
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 1367, in ?
    main()
  File "/usr/bin/pycentral", line 1361, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 883, in run
    self.options.exclude, byte_compile_default=True)
  File "/usr/bin/pycentral", line 671, in install
    self.default_runtime.byte_compile(self.private_files,
AttributeError: 'NoneType' object has no attribute 'byte_compile'
dpkg: error while cleaning up:
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/scons_0.96.93-2_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)