Regarding build the image with GPU

[grndng]

I am currently trying to build a GPU image as proposed in the README. Trying to set up a model for training with apptainer build tf2_addons.sif tf2_addons.def, I'm getting the following error message:

ERROR  : Failed to create user namespace: user namespace requires to set /proc/sys/kernel/unprivileged_userns_clone to 1
FATAL:   While performing build: while running engine: exit status 1

I'm not entirely sure why I'm getting that user message but checking /proc/sys/kernel/unprivileged_userns_clone manually, the value that is set inside that file is 1 already.

Looking into the tf2_addons.def file itself I can't really see anything that might point me to a solution so I'm not entirely sure where the error comes from. Can you help me out on this one? The container for serving the model seems to be created just fine (apptainer build tf_server.sif tf_server.def).