I have the same issue after installing the unprivileged daemon on a fresh Ubuntu Server 24.04 installation (x86_64).
I followed the instructions here to install Guix (under "Trying it"): https://hpc.guix.info/blog/2025/03/build-daemon-drops-its-privileges/ I then ran: `guix shell --container --pure bash` and got: `guix shell: error: while setting up the build environment: cannot set loopback interface flags: Operation not permitted`.
