I used umount to remove the USB backup drive and then deleted some more old images from the FOG server. I freed up about 4GB of disk space. I then used the reboot command. After rebooting, I can’t access via the web interface or putty SSH. However, I can ping the machine. When I try accessing with putty, the error is “Network error, connection refused” Hopefully there is an easy solution to this???
Plan B:
I just learned that we already have a newer FOG server built with no images on it. It is FOG version 1.2 running on Ubuntu 14. This is a virtual machine running on VMWare. It was built about a year ago with the intention of replacing our current FOG server. Our current FOG server is a physical machine.
However, when I powered it on and accessed the web interface, I got prompted to run the database schema installer / updater. When I ran it, I got a long list of Database SQL errors.
Can this be fixed? If so, I was wondering if I can transfer our existing images to this server. I have them on an external USB hard drive. I realize we would probably lose our existing client database, but we can accept that.
Plan 
If this schema error can’t be fixed, then I guess I am going to have to do a new FOG install and transfer the images. Could I just delete the current FOG install and reinstall on the same VMWare Ubuntu 14 server? I really don’t want to also have to build a new Ubuntu server unless it is absolutely necessary.
I know that is a lot – thanks for the help.