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I am getting below error when I try to run gdb.

from the command line. If type gdb , I get the following error.

root@ubuntu:~# gdb
    Traceback (most recent call last):
      File "/usr/lib/python2.7/site.py", line 68, in <module>
        import os
      File "/usr/lib/python2.7/os.py", line 398, in <module>
        import UserDict

    File "/usr/lib/python2.7/UserDict.py", line 83, in <module>
        import _abcoll
      File "/usr/lib/python2.7/_abcoll.py", line 11, in <module>
        from abc import ABCMeta, abstractmethod
      File "/usr/lib/python2.7/abc.py", line 8, in <module>
        from _weakrefset import WeakSet
      File "/usr/lib/python2.7/_weakrefset.py", line 5, in <module>
        from _weakref import ref
    ImportError: No module named _weakref 

How can I resolve this ?
Thank You

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