Mojave install a disaster

My upgrade to Mojave has been an mitigated disaster. First I could not even get past the 90% or so marker (on the little bar) after the first installation. After waiting for what I thought as an inordinate amount of time I did a hard restart. After restart the screen immediately jumped to where it left off. So I did a hard rest and went into recovery mode. selected reinstall Mojave. Did the same thing; stopped at the 90% mark. I finally let it run over night. This was yesterday. This morning I when I looked at the screen it was at the Login screen. I tried logging in but it was so slow and painful. After every letter I typed the beachball would spin. Another weird thing was the account picture was still in its original place (it happened to be on the far left) but would “inch” closer to being over the text box with every letter I typed.

I was finally able to log in. The desktop loaded by slowly. I tried selecting an applicat to get a window. Nothing. Finally I was able to get the computer to shutdown.

After looking for some help I found a message with a link to a YouTube video. There were four recommendations: 1) Hard restart, 2) boot into safe mode, 3) zap the PRAM, 4) Recovery mode. I tried all three nothing really worked. Maybe a slight, and I mean slight, increase in speed. Now I am upgrading a MacPro with 2 quad-core processors. And I am upgrading fron 10.13.X. Finally tried Recoveray mode again.

When I finally get to the desktop the strangest thing is I have no communications. Under the grayed out Wi-Fi icon in the menu bar it says “No WiFi hardware installed.” The Network pane in Systems Preferences shows nothing connected to the two Ethernet ports. I am writing this on my IPad, so I know the house network works.

I am am at my wits end. I made a backup of the drive BEFORE I started the upgrade but I have no way of “slicking” the SSD drive so I can do a clean install.

i really could use some help!