One of my mirrored boot sticks failed during the upgrade to 11.1-U3, so I tried to replace it with the 11.1-U3 GUI.
The replace failed with:
uwsgi: [middleware.exceptions:36] [MiddlewareError: [EFAULT] The device called
SanDisk Ultra Fit (28.64 GB, 60062500 sectors does not have enough space...