Updated GUFW to ensure absolute path of `gufw-pkexec` is always used.

[ediw8311xht]

Problem

When running gufw from the command line I came across this error:

(gufw.py:442919): Gtk-CRITICAL **: 23:10:39.470: _gtk_style_provider_private_get_settings: assertion 'GTK_IS_STYLE_PROVIDER_PRIVATE (provider)' failed
/usr/bin//gufw-pkexec: line 2: 442919 Segmentation fault      (core dumped) python3 /usr/lib/python3.10/site-packages/gufw/gufw.py "$@"

Explanation

The important bit is /usr/bin//gufw-pkexec

In the polkit com.ubuntu.pkexec.gufw.policy file it has this line:

<annotate key="org.freedesktop.policykit.exec.path">/usr/bin/gufw-pkexec</annotate>

Polkit does not recognize the paths being the same since it includes a double forward slash ('//').

I confirmed this was the issue by adding this line into this file:

<annotate key="org.freedesktop.policykit.exec.path">/usr/bin//gufw-pkexec</annotate>

Which when I restarted the polkit service I was able to run the program without error.

Obviously this is not a good solution as it would not solve any other forward slash issue, so I provided a better solution, which can be seen in my pull request.

Solution: Get Absolute Path of gufw-pkexec

Before: pkexec gufw-pkexec $c_user

After: pkexec "$(which gufw-pkexec)" $c_user

This ensures the correct path of gufw-pkexec will always be sent.

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[costales]

Sorry for the delay. Thank you so much @ediw8311xht !!