Never mind, please disregard; as it turns out I was out of disk space and was unaware of it. I removed some files and all is okay. Thanks
I feel my problem started after in did the updates and rebooted today.
I can't get out of the KDE login screen except for Console which works.
In Console, I effectively changed root and user passwords and rebooted to no avail.
I attempted to make Gnome login screen the default boot screen with
#update-alternatives --config default.plymouth
I checked manual plymouth
#update-initramfs -u #update-grub
rebooted and the KDE login screen still occurs