It must be in some libQt5 related packages from your distro...
on the one I use (openSUSE Tumbleweed, RPM based, though) the most basic Qt5 widget styles comes on a package named libqt5-qtstyleplugins... of course I know near to nothing about ubuntu/debian packaging naming conventions :)
It must be in some libQt5 related packages from your distro...
on the one I use (openSUSE Tumbleweed, RPM based, though) the most basic Qt5 widget styles comes on a package named libqt5-qtstyleplugins... of course I know near to nothing about ubuntu/debian packaging naming conventions :)
hth.
cheers