I've tried all the workarounds as best I'm able. I've booted the board with every combination of USB keyboard, mouse, and powered hub I have, with the long USB cable attached, with no USB cable attached. I've transferred the SD card to another machine and looked at the syslog, but I don't know what to do with the information there. I connected via ssh, but don't know what to do once I'm connected. I tried reading through the "speeding up Ubuntu" guide, but it is out of date for the latest release of everything (e.g. under the section particularly noted for helping with USB problems (dvtmps enabling, or something like that), the nodes are already present, "nano" isn't recognized when I try to use it in any commands in the terminal, and the instructions say "don't use this with the latest release", although not in those exact words).
My syslog is attached to this thread: viewtopic.php?f=50&t=1375
One thing I have noticed is that the boot screen consistently shows:
Starting SystemD Login Management [fail]
Or it could be the line above that. If that is indicated in the syslog, somewhere, it should be there on the other thread. Nothing else indicates [fail].
The board will be essentially useless to me if I have to start it up with workarounds every time, but I can't even get it to start with those. I think I'm done trying with this board unless someone can give me step by step instructions on how to fix it via ssh--not just a drawn out back and forth for attempted trouble shooting. That will take me days to try out each suggested step and submit the results. It has already taken weeks to try all the workarounds in this thread. I don't have a convenient time or place to be borrowing alternative monitors and keyboards (which is what I've done to try the workarounds), since it is not working with the Lapdock that I purchased specifically for use with the board.