Why pip install not working in Jupyter notebook?

Question

When i run pip3 install <package> or !pip3 install <package> or !pip install <package> i get this error. And also i can't clone any repo in jupyter. It gives the same error. This is my first time in Jupyter.

---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
Input In [18], in <cell line: 1>()
----> 1 get_ipython().run_line_magic('pip', 'install boto3')

File /lib/python3.9/site-packages/IPython/core/interactiveshell.py:2294, in InteractiveShell.run_line_magic(self, magic_name, line, _stack_depth)
   2292     kwargs['local_ns'] = self.get_local_scope(stack_depth)
   2293 with self.builtin_trap:
-> 2294     result = fn(*args, **kwargs)
   2295 return result

File /lib/python3.9/site-packages/IPython/core/magics/packaging.py:75, in PackagingMagics.pip(self, line)
     72 else:
     73     python = shlex.quote(python)
---> 75 self.shell.system(" ".join([python, "-m", "pip", line]))
     77 print("Note: you may need to restart the kernel to use updated packages.")

File /lib/python3.9/site-packages/IPython/core/interactiveshell.py:2451, in InteractiveShell.system_piped(self, cmd)
   2446     raise OSError("Background processes not supported.")
   2448 # we explicitly do NOT return the subprocess status code, because
   2449 # a non-None value would trigger :func:`sys.displayhook` calls.
   2450 # Instead, we store the exit_code in user_ns.
-> 2451 self.user_ns['_exit_code'] = system(self.var_expand(cmd, depth=1))

File /lib/python3.9/site-packages/IPython/utils/_process_posix.py:148, in ProcessHandler.system(self, cmd)
    146     child = pexpect.spawnb(self.sh, args=['-c', cmd]) # Pexpect-U
    147 else:
--> 148     child = pexpect.spawn(self.sh, args=['-c', cmd])  # Vanilla Pexpect
    149 flush = sys.stdout.flush
    150 while True:
    151     # res is the index of the pattern that caused the match, so we
    152     # know whether we've finished (if we matched EOF) or not

File /lib/python3.9/site-packages/IPython/utils/_process_posix.py:57, in ProcessHandler.sh(self)
     55     self._sh = pexpect.which(shell_name)
     56     if self._sh is None:
---> 57         raise OSError('"{}" shell not found'.format(shell_name))
     59 return self._sh

I searched everywhere, but it is weird that no-one faced this issue except me. Pls provide some solution for this. I'm getting crazy.