Some restbase hosts appear to be suffering the same issues encountered in T297422/T296856 and cannot boot correctly into the installer.
As it stands the nodes we've seen this with so far are
- restbase2017
- restbase2019
- restbase2020
- restbase1019
- restbase1020
- restbase1021
- restbase1022
- restbase1023
- restbase1024
- restbase1025
- restbase1026
- restbase1027