Currently there are a few issues:
OpenBLAS fails during compile as it cannot detect the CPU type. A long error log will be spit out when this happens... again, you can check the status of your build with erp5-show -s and if there is an error, view /opt/slapos/log/slapos-node-software.log. Here you will find the output of slapos node software. To make it easier to read and follow, use tail -f.
slapos node software
TARGET=CORE2 slapos node software
Error Type: OperationalError
Error Value: (1129, "Host '10.0.221.219' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'") """
To fix one must restart MariaDB (in command we restart all just in case):
" ERROR No IPv6 found on interface No valid IPv6 found on lo. to construct IPv6 with" message
root@debian8:~# slapos node format --now
root@debian8:~# slapos node restart all