Welcome at the purple fun 
first think is that you have selected xfce4 and kde Desktop to be both installed… better not to do that.
The issue that let the install itself fail is a package name change from solid → solid5 if you install KDE open the package list on the packages screen and unselect solid in the list …
Seems you do not get the hotfix we send out hour ago… can happen if you can not access github or gitlab or both…