Lubuntu 24.10 is the first release of Lubuntu to ship with a primarily Qt 6-based environment. Previous LXQt releases used Qt 5. Due to this upgrade, modern Qt 6-based apps such as the latest versions of VirtualBox, qBitTorrent, and more will now be themed similar to the rest of the desktop. Qt 5 app theming also still works, allowing you to continue to use apps that haven't caught up with Qt 6 yet. Lubuntu-specific applications (namely Lubuntu Update and the Lubuntu Installer Prompt) have also been updated to use Qt 6. The Calamares installer continues to use Qt 5 however. We expect to switch Calamares to using Qt 6 for Lubuntu 25.04. For a while now, Lubuntu has been using the Breeze theme from KDE Plasma. While this has worked well enough for a while, it has had some incompatibilities with LXQt crop up before, and this cycle it happened again. Rather than continuing to make a KDE component work where it wasn't really designed to, Lubuntu 24.10 now ships with Kvantum theming.
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