u/Superb_Plane2497

https://launchpad.net/~kubuntu-ppa

backports and updates both have 6.6.5, the first new point release after 26.04 launch.

26.04 is "Resolute"

The updates PPA is described as being an early release of updates destined for official 26.04 updates (point releases). The backports PPA typically includes new KDE releases which won't be officially supported.