Starting off installing Plasma 6 on 15.0 requires users install/upgrade all the "testing" packages, especially the "graphics-updates" ones over the stock system and usual security patch updates. Packages listed with the "_lngn" suffix are either new or upgraded Slackware packages which are required deps for Plasma 6. Packages either needed qt6 support or updates to meet the plasma requirements. Packages with "_SBo" suffix are the same available on slackbuilds.org, these were used for any other extra deps like qt6 and others. Please run "upgradepkg --install-new --reinstall *.t?z" in order to install all required packages.