miniterm.py crashed with ImportError in __main__: No module named serial

[Harada83]

I have no idea!!!

I have launch from comand line

miniterm.py

The output is:

Traceback (most recent call last):
  File "/usr/bin/miniterm.py", line 11, in <module>
    import sys, os, serial, threading
ImportError: No module named serial

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: python-serial 2.5-1
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic x86_64
Architecture: amd64
Date: Tue Mar 8 22:15:40 2011
ExecutablePath: /usr/bin/miniterm.py
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/miniterm.py
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
 LANGUAGE=en_US:en
PythonArgs: ['/usr/bin/miniterm.py']
SourcePackage: pyserial
Title: miniterm.py crashed with ImportError in __main__: No module named serial
Traceback:
 Traceback (most recent call last):
   File "/usr/bin/miniterm.py", line 11, in <module>
     import sys, os, serial, threading
 ImportError: No module named serial
UpgradeStatus: Upgraded to natty on 2011-02-28 (8 days ago)
UserGroups: adm admin cdrom dialout lpadmin netdev plugdev sambashare vboxusers