dpkg: ошибка processing package unity-tweak-tool (-я конфигурировал)

when i run apt-get install, apt-get upgrade, apt-get-f install, it always return this:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
1 not fully installed or removed.
Need to get 0 B/333 kB of archives.
After this operation, 0 B of additional disk space will be used.
dpkg: error processing package unity-tweak-tool (--configure):
 package is in a very bad inconsistent state; you should
 reinstall it before attempting configuration
Errors were encountered while processing:
 unity-tweak-tool

What's wrong? I try all command like apt-get remove, purge, clean and there is не effect and still return ошибка.

[EDIT] i try to reinstall unity tweak tool, but it returns:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 4 not upgraded.
1 not fully installed or removed.
Need to get 0 B/333 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 216695 files and directories currently installed.)
Preparing to unpack .../unity-tweak-tool_0.0.6ubuntu1_all.deb ...
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Fatal Python error: Py_Initialize: Unable to get the locale encoding
ImportError: No module named 'encodings'
Aborted (core dumped)
dpkg: warning: subprocess old pre-removal script returned error exit status 134
dpkg: trying script from the new package instead ...
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Fatal Python error: Py_Initialize: Unable to get the locale encoding
ImportError: No module named 'encodings'
Aborted (core dumped)
dpkg: error processing archive /var/cache/apt/archives/unity-tweak-tool_0.0.6ubuntu1_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 134
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Fatal Python error: Py_Initialize: Unable to get the locale encoding
ImportError: No module named 'encodings'
Aborted (core dumped)
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 134
Errors were encountered while processing:
 /var/cache/apt/archives/unity-tweak-tool_0.0.6ubuntu1_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)