Score:37

Ubuntu

ubuntu-drivers "UnboundLocalError: local variable 'version' referenced before assignment" when installing nvidia drivers

Jeff

10/21/23, 4:26 PM

I am running into trouble reinstalling my nvidia drivers after the latest kernel upgrade. Normally, ubuntu-drivers handles it, but not this time.

I've done sudo apt purge -y nvidia-*, which often fixes problems when reinstalling, but that didn't help.

When I run ubuntu-drivers install, I get this error:

Traceback (most recent call last):
  File "/usr/bin/ubuntu-drivers", line 513, in <module>
    greet()
  File "/usr/lib/python3/dist-packages/click/core.py", line 1128, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 1053, in main
    rv = self.invoke(ctx)
  File "/usr/lib/python3/dist-packages/click/core.py", line 1659, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib/python3/dist-packages/click/core.py", line 1395, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib/python3/dist-packages/click/core.py", line 754, in invoke
    return __callback(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/decorators.py", line 84, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 754, in invoke
    return __callback(*args, **kwargs)
  File "/usr/bin/ubuntu-drivers", line 413, in install
    command_install(config)
  File "/usr/bin/ubuntu-drivers", line 187, in command_install
    UbuntuDrivers.detect.nvidia_desktop_pre_installation_hook(to_install)
  File "/usr/lib/python3/dist-packages/UbuntuDrivers/detect.py", line 839, in nvidia_desktop_pre_installation_hook
    with_nvidia_kms = version >= 470
UnboundLocalError: local variable 'version' referenced before assignment

Is the with_nvidia_kms message at the bottom related at all to DKMS? I had numerous problems in the past getting dkms to work in the past, before switching to ubuntu-drivers.

This was all working until a recent upgrade, which involved a kernel.

18298

1 + 1

nvidia

ubuntu-drivers

Andrew Marshall

10/21/23, 5:41 PM

See https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-common/+bug/1993019

Score:68

Ubuntu

Yaseen

10/29/23, 2:42 AM

Had the same issue today. Fixed it by editing the /usr/lib/python3/dist-packages/UbuntuDrivers/detect.py" file and replace line 835 with this line:

version = int(package_name.split('-')[-2])

The only change I'm bringing is -2 instead of -1. Otherwise it raises a ValueError inside the try block and just doesn't give any value to the version variable.

Check out https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-common/+bug/1993019 if that was confusing

+ 7

igormcoelho

11/5/23, 12:28 AM

Thanks for this precise fix. Changed here from -1 to -2 and it worked (Ubuntu 22.04): `sudo ubuntu-drivers install nvidia`

hafiz031

12/3/23, 1:14 PM

A safer approach may be keeping it inside another `try` block inside `except ValueError:` block.

Nathaniel Hoyt

2/15/24, 6:40 AM

this also worked for me with ubuntu 22.04.

Vikram Saraph

5/21/24, 8:22 PM

+1 working for me as well as of this writing. Ubuntu 22.04.

ubfan1

5/22/24, 3:38 PM

Or you may just avoid the nvidia drivers with names ending in "-open". Some scripts are looking for a version as the last thing in the name.

Gal Avineri

7/10/24, 10:08 AM

A fix has been released (as stated in the link in the answer). updating via the Software Updater GUI solved this for me.

Artem S. Zhelonkin

8/4/24, 8:46 AM

If version has something like `-server-open`, then we need change it to `version = int(package_name.split('-')[-3])`

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: ubuntu-drivers "UnboundLocalError: local variable 'version' referenced before assignment" when installing nvidia drivers

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