nix GC Warning: pthread_getattr_np when trying to install nix package manager

When installing the nix package manager by the following description https://chris-martin.org/2016/installing-nix-package-manager im always getting the following errors. After the installation i can't use the nix-shell command either without getting the GC error.

`copying Nix to /nix/store................................ GC Warning: pthread_getattr_np or pthread_attr_getstack failed for main thread GC Warning: pthread_getattr_np or pthread_attr_getstack failed for main thread installing 'nix-2.3.1' building '/nix/store/cb6ss4jv8baxkq2pi6fnviqp9zyna73l-user-environment.drv'... created 6 symlinks in user environment GC Warning: pthread_getattr_np or pthread_attr_getstack failed for main thread GC Warning: pthread_getattr_np or pthread_attr_getstack failed for main thread GC Warning: pthread_getattr_np or pthread_attr_getstack failed for main thread unpacking channels... GC Warning: pthread_getattr_np or pthread_attr_getstack failed for main thread created 1 symlinks in user environment

Installation finished! To ensure that the necessary environment variables are set, either log in again, or type`

/etc/nix/nix.conf with the sandbox=false property is set.

Thanks

Best regards