$ kbuildsycoca4 && kquitapp plasma-desktop && kstart plasma-desktop
kbuildsycoca4 running...
kbuildsycoca4(515) KConfigGroup::readXdgListEntry: List entry text/html in "/home/reg/.local/share/applications/mimeapps.list" is not compliant with XDG standard (missing trailing semicolon).
<unknown program name>(519)/: "Application plasma-desktop could not be found using service org.kde.plasma-desktop and path /MainApplication."
$