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

Question

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.

See https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-common/+bug/1993019 — Andrew Marshall, Oct 21 '22 at 17:41

score 68 · Accepted Answer · edited Jan 12 '23 at 09:21

68

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

edited Jan 12 '23 at 09:21

Marc Vanhoomissen

2,198
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answered Oct 29 '22 at 02:42

Yaseen

796
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4

Thanks for this precise fix. Changed here from -1 to -2 and it worked (Ubuntu 22.04): `sudo ubuntu-drivers install nvidia` – igormcoelho Nov 05 '22 at 00:28
A safer approach may be keeping it inside another `try` block inside `except ValueError:` block. – hafiz031 Dec 03 '22 at 13:14
4

this also worked for me with ubuntu 22.04. – Nathaniel Hoyt Feb 15 '23 at 06:40
+1 working for me as well as of this writing. Ubuntu 22.04. – Vikram Saraph May 21 '23 at 20:22
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. – ubfan1 May 22 '23 at 15:38
3

A fix has been released (as stated in the link in the answer). updating via the Software Updater GUI solved this for me. – Gal Avineri Jul 10 '23 at 10:08
If version has something like `-server-open`, then we need change it to `version = int(package_name.split('-')[-3])` – Artem S. Zhelonkin Aug 04 '23 at 08:46

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

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