grayed buttons in Additional Drivers

[Kristoffer Sokolowski]

Not possible to install nvidia drivers using "Software Sources"->"Additional Drivers".

When selecting driver using radio-box the following excetpion occurs.

nvidia-driver-525-server <class 'str'>
None <class 'NoneType'>
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py", line 1067, in on_driver_selection_changed
    modules_package_obj = self.apt_cache[modules_package]
TypeError: Expected a string or a pair of strings

Because the follwing row returns "None"

modules_package = detect.get_linux_modules_metapackage(self.apt_cache, pkg_name)

Current version:
$ apt list --installed | grep software

python3-software-properties/jammy-updates,jammy-updates,now 0.99.22.4 all [installerat,automatiskt]
software-properties-common/jammy-updates,jammy-updates,now 0.99.22.4 all [installerat,automatiskt]
software-properties-qt/jammy-updates,jammy-updates,now 0.99.22.4 all [installerat,automatiskt]

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Thomas Queste (tomsquest)]

Occuring also with version 0.99.27 upon selection of an entry.

```
$ sudo software-properties-qt
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py", line 1063, in on_driver_selection_changed
    modules_package_obj = self.apt_cache[modules_package]
TypeError: Expected a string or a pair of strings
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py", line 1059, in on_driver_selection_changed
    pkg = self.apt_cache[pkg_name]
TypeError: Expected a string or a pair of strings

```

```
$ apt list --installed | grep software

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

python3-software-properties/kinetic,kinetic,now 0.99.27 all [installed,automatic]
software-properties-common/kinetic,kinetic,now 0.99.27 all [installed,automatic]
software-properties-qt/kinetic,kinetic,now 0.99.27 all [installed,automatic]
```

[Thomas Queste (tomsquest)]

Related: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1993370