error installing unsloth in python virtualenv

gistfile1.txt

(env-unsloth) fox@ai:~$ pip install "unsloth[cu121_ampere] @ git+https://github.com/unslothai/unsloth.git"
Collecting unsloth[cu121_ampere]@ git+https://github.com/unslothai/unsloth.git
  Cloning https://github.com/unslothai/unsloth.git to /tmp/pip-install-1v7p_k83/unsloth_c0bb12f6e08849a6afa66cb8e700f678
  Running command git clone --filter=blob:none --quiet https://github.com/unslothai/unsloth.git /tmp/pip-install-1v7p_k83/unsloth_c0bb12f6e08849a6afa66cb8e700f678
  Resolved https://github.com/unslothai/unsloth.git to commit c1ac4d2707574868767345e76ebe49c8353f9057
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
  Preparing metadata (pyproject.toml) ... done
Collecting bitsandbytes (from unsloth[cu121_ampere]@ git+https://github.com/unslothai/unsloth.git)
  Obtaining dependency information for bitsandbytes from https://files.pythonhosted.org/packages/9b/63/489ef9cd7a33c1f08f1b2be51d1b511883c5e34591aaa9873b30021cd679/bitsandbytes-0.42.0-py3-none-any.whl.metadata
  Using cached bitsandbytes-0.42.0-py3-none-any.whl.metadata (9.9 kB)
Collecting flash-attn (from unsloth[cu121_ampere]@ git+https://github.com/unslothai/unsloth.git)
  Using cached flash_attn-2.4.2.tar.gz (2.4 MB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  error: subprocess-exited-with-error
  
  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [20 lines of output]
      Traceback (most recent call last):
        File "/home/fox/env-unsloth/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
          main()
        File "/home/fox/env-unsloth/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
          json_out['return_val'] = hook(**hook_input['kwargs'])
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/home/fox/env-unsloth/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
          return hook(config_settings)
                 ^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-16c20w3x/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 325, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=['wheel'])
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-16c20w3x/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 295, in _get_build_requires
          self.run_setup()
        File "/tmp/pip-build-env-16c20w3x/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 480, in run_setup
          super(_BuildMetaLegacyBackend, self).run_setup(setup_script=setup_script)
        File "/tmp/pip-build-env-16c20w3x/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 311, in run_setup
          exec(code, locals())
        File "<string>", line 9, in <module>
      ModuleNotFoundError: No module named 'packaging'
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.