In case anyone lands here / is still having issues with installing KDE, I just installed it again and made some notes:
Installed on a fresh kvm/qemu RL 8.5 VM ( 4 threads, 4G RAM , virtIO qcow2 live file with a backing file ).
Host is RL 8.4 on a Dell Precision 32G Ram, 12 threads.
- Installed RL 8.5 from dvd iso img
- Rebooted VM
- Launch terminal and su to root
- dnf config-manager --set-enabled powertools ( important to do this BEFORE KDE install later. )
- dnf -y install epel-release
- dnf -y update
- dnf groupinstall -y “KDE Plasma Workspaces”
- systemctl enable sddm.service -f
- reboot
- At the login, select “Plasma (X11)” for desktop session at the bottom of the screen, enter password, hit return and WAIT.
- It did appear to hang a bit ( a min or 2 most ) here but came through in the end…
And all seems reasonably responsive/OK.