This section will help you debug (from the system administrator’s perspective) Singularity.
Not installed correctly, or installed to a non-compatible location
Singularity must be installed by root into a location that allows for
SUID programs to be executed (as described above in the installation section of this manual). If you fail to do that, you may have user’s reporting one of the following error conditions:
ERROR : Singularity must be executed in privileged mode to use images ABORT : Retval = 255
ERROR : User namespace not supported, and program not running privileged. ABORT : Retval = 255
ABORT : This program must be SUID root ABORT : Retval = 255
If one of these errors is reported, it is best to check the installation of Singularity and ensure that it was properly installed by the root user onto a local file system.