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Lubuntu 18.10 uses LXQt as its desktop environment. There are some common features shared between KDE Plasma and LXQt.

One such feature is the presence of /usr/share/color-schemes.

In Lubuntu 18.10, there are a few color schemes available in /usr/share/color-schemes:

dkb@dkb-LXQt:/usr/share/color-schemes$ ls
Breeze.colors  BreezeDark.colors  BreezeHighContrast.colors  BreezeLight.colors
dkb@dkb-LXQt:/usr/share/color-schemes$ 

In Kubuntu, there's a GUI to select and even to edit color schemes. The GUI can be accessed by running

kcmshell5 colors

GUI for color schemes

and this GUI accesses all the color schemes in /usr/share/color-schemes and in ~/.local/share/color-schemes.

However, in Lubuntu 18.10, the only GUI I could find lists only the Breeze scheme from the schemes available in /usr/share/color-schemes as well as two others, Windows and Fusion, which are not listed in /usr/share/color-schemes.

LXQt GUI

And I couldn't find a GUI to modify even the Breeze color scheme. kcmshell5 --list doesn't offer colors.

So my questions are:

  • can a Lubuntu 18.10 user use, for example, BreezeDark, since it's listed in /usr/share/color-schemes?

  • is there a GUI available in the default Lubuntu 18.10 to edit even just the Breeze color scheme failing which can a package be installed from the repositories that provides this facility?

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Not only I am not aware of a such GUI for LXQt-only, but I don't think the changes you mention (colors) will affect LXQT.

I guess what you want is a pure LXQT, and not what I do, namely using the Plasma tool systemsettings (KDE System Settings). That might trigger a lot of kde dependencies (but that doesn't bother me, because I personally use a lot more kde than that, especially kwin and dolphin).

But even so, if you do not use kwin, installing all those isn't worth it, and the changes you want are not visible in LXQT it seems to me. The KDE/Qt Styles are shared by KDE and LXQt, but the changes you mention for colors, which I can make with the KDE Settings tool, are barely reflected in LXQT. What affects Lxqt looks is the style (the texture), the LXQT theme (mainly the panel) - LXQT Appearance takes care of those two - and openbox settings for windows. (On the other hand, when using kwin instead of openbox, changes in kcmshell5 colors are reflected by Kwin - e.g. you can have a dark Oxygen window theme).

If you do not want to install the KDE settings tool, but still want a lot more styles, try installing from repos more kde-styles, as they will then appear in the LXQt settings and can be selected from there. (On that, take a look at Lxqt: what are the Qt-themes/Widget Styles, and how to install new ones?).

Even more interesting might be using Kvantum, a Qt themes manager which is not KDE-sprecific, but encompasses LXQt, comes with a lot of themes and has its own settings tool, Kvantum Manager.

enter image description here

Better install latest release from here and avoid some bugs mentioned here.

For what it's worth, here's a glimpse of my Lubuntu 18.10 LXQt+Kwin with Kvantum-dark as Qt-style, KvSimplicityDark as Kvantum theme, selected also under kcmshell5 colors:

enter image description here

Thanks to your post I have realized that the setting you mention under kcmshell5 colors - or simply "Colors" under the KDE System Settings - was needed to have exactly the same color/texture in the window frame (a kwin setting) and the rest of the window (a qt-style setting). From that I conclude that the kcmshell5 colors setting only affects kwin and will not affect openbox, while the rest of the lxqt theming is not controlled from kcmshell5 colors.

On the other hand, Kvantum comes with a lot of Openbox themes which can be selected in Openbox Settings to mach the qt-style theme.

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  • Thanks for replying and for the kvantum information. During much of 16.04, I used the Openbox session of Lubuntu and got really used to it. But after switching to Kubuntu, I'm quite at home with kwin. But I wanted to give Lubuntu 18.10 a fair look to see if LXQt, as implemented by Lubuntu, has any significant positives for me. At least for now, I don't see it having anything to offer me that I can't have in Kubuntu unless, as you point out, I add more "kde" stuff which, in a way, makes little sense.
    – DK Bose
    Nov 19, 2018 at 12:35
  • @DKBose - well, I prefer lxqt to plasma for the very reason that what I liked in plasma I can have in lxqt, an then I think it even looks better, as I am not a fan of plasma looks, whether breeze or otherwise themed. Looking at my image above, the oxygen-themed window has larger and crispier buttons than in Plasma. Also, lxqt is significantly lighter than plasma, kwin crashed more often in plasma. But lxqt needs a lot more customizations to make it "ring".
    – user47206
    Nov 19, 2018 at 12:49
  • @DKBose - I have to say that of late I have come back to Plasma5 as such (without LXQt). I suspect the Plasma-lxqt mix that I used was the culprit in freezes on my laptop when heavy loading internet browsers. On the other hand I do not like LXQt pure, without Dolphin, kwin etc. I have therefore installed Kubuntu 18.10 minimal.
    – user47206
    Nov 28, 2018 at 13:20
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    I have Kubuntu 18.10 (with the kubuntu backports ppa) in a VM but pleae see askubuntu.com/a/1093955/248158 in case a bug I filed isn't fixed for those wanting to upgrade from Kubuntu 18.10 to Kubuntu 19.04 when the time comes.
    – DK Bose
    Nov 28, 2018 at 13:29

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