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

[Aere Greenway]

On 1/9/19 6:47 AM, Israel wrote:
> On 1/8/19 5:04 PM, Aere Greenway wrote:
>> On 1/8/19 2:07 PM, Israel wrote:
>>> On 1/7/19 10:06 PM, Aere Greenway wrote:
>>>> Lubuntu Users Group:
>>>>
>>>> (Sorry - I initially sent this from the wrong e-mail address)
>>>>
>>>>
>>>> To mount my NFS drive on my local client systems, I needed something
>>>> to get ask the user for root privilege.
>>>>
>>>> On Lubuntu 16.04, I used gksu, but on Lubuntu 18.04, that package
>>>> appears to be unavailable.
>>>>
>>>> So in its place, I installed lxqt-sudo, and used that.
>>>>
>>>> However, after installing that, a number of applications no longer
>>>> have their normal Gnome look-and-feel, but instead, have a dark look,
>>>> and take up a huge (much more than necessary) amount of screen
>>>> real-estate.
>>>>
>>>> The applications I'm having this problem with, are:
>>>>
>>>> qjackctl
>>>>
>>>> qsynth
>>>>
>>>> qmidiroute
>>>>
>>>> Does anyone know how I can change them back to their former Gnome
>>>> look-and-feel (or even explain what has happened)?
>>>>
>>>> The strange thing is, on some of my 18.04 systems, this didn't happen
>>>> - those applications still have their usual Gnome look-and-feel.
>>>>
>>>> I have been unable to determine why it is okay on some of my systems,
>>>> and not on other systems.
>>>>
>>>> - Aere
>>>>
>>> Aere,
>>>
>>> Those are Qt apps, are you using LXDE or LXQt?
>>>
>>> If you are using LXDE then, installing lxqt-sudo probably installed some
>>> more things, and changed a Qt setting.
>>>
>>> You can make sure you have the Qt GTK+ engine
>>>
>>> sudo apt install qt5-gtk-platformtheme
>>>
>>> This hopefully will fix it.  If not, look for a Qt settings (or KDE
>>> settings) in your /usr/share/applications/
>>>
>>> Then launch this and change it to the qt gtk+ engine
>>>
>> Israel:
>>
>> Thank you for your expertise, and your ideas.
>>
>> I am using LXDE.
>>
>> I performed the apt install qt5-gtk-platformtheme statement.  It
>> indicated the latest version of it was already installed, and the
>> newest version.
>>
>> I launched qjackctl, and it still has the strange, dark, look-and-feel.
>>
>> I couldn't find anything in /usr/share/applications/ that resembled QT
>> settings, or KDE settings.  In Synaptic Package Manager, I searched
>> for "kde-settings", "kdesettings", "qt-settings", and "qtsettings",
>> but none of those searches found anything.
>>
>> Is there something I could install that would allow me to change the
>> settings?
>>
> Hi Aere,
>
> I am not 100% sure what needs to be installed, but I found an answer.
> The main thing you need to do is change the Qt theme to use the Qt GTK+
> engine.  I am sure there is a way to change the theme from the terminal
> (like with GTK), but I don't use Qt as much as FLTK/GTK toolkits.
>
> I found this question on AskUbuntu:
>
> https://askubuntu.com/questions/716714/change-qt5-theme
>
> tl;dr
>
> Use either of these:
>
> lxqt-config
>
> qt5ct
>
Israel:

The askubuntu link was helpful.  I installed qt5ct, and ran it.

    It displayed an error-message dialog, reporting the following:

    Please remove the QT_STYLE_OVERRIDE environment variable

    The QT_QPA_PLATFORMTHEME environment variable is not set correctly

    (the window has only an "OK" button)

Unfortunately, I could not find anything for configuring the evironment 
variables.

How do I change the environment variables that are in-effect when I 
sign-on to my Lubuntu system?

- Aere

-- 
Sincerely,
Aere

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/lubuntu-users/attachments/20190109/c2c9c68e/attachment.html>