I am doing a fresh Leap15 install, real iron, real disk.  Initially I picked
the wrong partition to install on, only 160Mb, so when I wanted to alter the
software selection, I was told "Error: Out of disk space! ":

Partition���Used        ���Free        ���Total       ���%                         
���/       ���    1.90 GiB���   -1.75 GiB���   159.3 MiB���1222%   

Very reasonable.
I realised my mistake, and went to change the partitioning. I deleted
everything, created just one partition, 75Gb.  Went forward up until it was
time to change the software selection, when I was told again "Error: Out of
disk space! ".

Remarkably, I was then permitted to continue changing the software selection.
and although I kept getting a warning every now and then, the installation
seemed able to start.  

Now I got a couple of pop-ups "Unexpected situation found in the system.",
details saying "wait_for_devices failed /dev/sda1".  I said continue a couple
of times, and right now the installation seems to be running.

I'll attach some logs later.