[lubuntu-users] Strange, dark, look-and-feel of qjackctl, qsynth, and qmidiroute on Lubuntu 18.04

[Aere Greenway]

On 1/10/19 8:52 PM, Aere Greenway wrote:
> On 1/10/19 6:46 PM, Israel wrote:
>> On 1/9/19 11:47 AM, Eric Bradshaw wrote:
>>>
>>> ...
>>>
>>>
>>> Dear Aere,
>>>
>>> The C4C Lubuntu 18.04 ReSpin now uses pkexec 
>>> [https://www.freedesktop.org/software/polkit/docs/0.015/pkexec.1.html] 
>>> in place of gksu. By utilizing the method put forth by and the 
>>> policy files created by Allen Guarnes 
>>> [https://www.allenguarnes.com/technology/resolving-the-missing-gksu-command-in-ubuntu-18-04/] 
>>> you should be able to do what you want and have everything look just 
>>> the same as it did. In ebery case I've tried, I've been able to 
>>> replace gksu with pkexec. For example, the command gksu pcmanfm can 
>>> be replaced with pkexec pcmanfm.
>>>
>>> Eric
>>> --
>>> Thank you,
>>> God bless you,
>>> Computers4Christians
>>> http://computers4christians.org
>>>
>> Hi,
>>
>> I agree that pkexec is the current best practice.  You will need to 
>> make a pkexec file for the programs if they do not have one, though.
>>
>> I am not sure though if systemd is replacing PolicyKit (they've 
>> replaced many many many things).  So this may be a temporary solution 
>> (should work for a few years at least).
>>
>> Aere,
>>
>> I did some looking around and Arch (as per usual) has a really 
>> helpful page about this
>>
>> https://wiki.archlinux.org/index.php/Uniform_look_for_Qt_and_GTK_applications#QGtkStyle
>>
>> tl;dr
>>
>> If they are Qt4 apps
>>
>> echo "[Qt]
>>
>> style=GTK+" >> ~/.config/Trolltech.conf
>>
>> If they are Qt5
>>
>> sudo apt install qt5-style-plugins
>>
>> Then you need to set this variable (so I am adding it to the xinitrc)
>>
>> |echo "QT_QPA_PLATFORMTHEME=gtk2" >> .~/xinitrc|
>>
>> This should get you back on track :D
>>
>> -- 
>> Regards
>>
> Israel:
>
> They are definitely qt5 applications.
>
> I have attached a screenshot of the error dialog to this e-mail as a 
> ".png" file.
>
> I tried what you said to do for qt5, with results as follows:
>
> qt5-style-plugins were already installed, and the latest version.
>
> Your echo command didn't work.  In reading the URL info, I think it 
> should have been:
>
> |echo "QT_QPA_PLATFORMTHEME=gtk2" >> |||~/|.xinitrc
> |
>
> |But that didn't work either.  Signing-in didn't work either.
> |
>
> |If I could just figure out where lxqt-sudo is defining 
> QT_STYLE_OVERRIDE, and remove it, I think I would be able to fix my 
> systems.
> |
>
> -- 
> Sincerely,
> Aere
>
With the helpful information you provided, I was able to finally figure 
out how to fix my systems.

I edited the ".config/lxsession/lubuntu/desxtop.conf" file of my home 
folder.

In the "[Environment]" section, I commented-out (put a period in front 
of) the following lines:

qt/force_theme=gtk

qt/platform=lxqt


I then logged-out, and signed-in again.  I can now run 
Menu...Preferences...Qt5 Settings

But I don't have to - the problem (the strange dark color scheme, and 
excessively large window sizes) has gone away.

Thank you for all your help, and also thanks for the suggestions of 
others on this list.

-- 
Sincerely,
Aere

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