I installed the DisplayLink USB Graphics Software for Mac OS X and macOS 4.3.1 on my MB Pro 2014 Edition running Sierra 10.12.6. When prompted to restart, a log message appeared on the screen stating it was "Waiting for remote debugger connect" (see attached startupLogMsg01.jpg).
startupLogMsg01.jpg
After a few minutes of hanging on that screen, I restarted the machine while holding down "cmd+r" which allowed me to start Disk Utility. Inspecting the hard drive, the used space is exactly that of the capacity (see attached maxCapacity01.jpg and maxCapacity02.jpg).
maxCapacity01.jpg
maxCapacity02.jpg
How can I get my machine to start up again?