LHC@home

I'm trying Atlas native, but getting errors. Can someone diagnose what I have done wrong, and how I should fix it:

[2025-05-24 08:21:03] Using apptainer image /cvmfs/atlas.cern.ch/repo/containers/fs/singularity/x86_64-centos7
[2025-05-24 08:21:03] Checking for apptainer binary...
[2025-05-24 08:21:03] Using apptainer found in PATH at /usr/bin/apptainer
[2025-05-24 08:21:03] Running /usr/bin/apptainer --version
[2025-05-24 08:21:04] apptainer version 1.3.4
[2025-05-24 08:21:04] Checking apptainer works with /usr/bin/apptainer exec -B /cvmfs /cvmfs/atlas.cern.ch/repo/containers/fs/singularity/x86_64-centos7 hostname
[2025-05-24 08:21:05] apptainer isnt working: #[91mERROR  : Could not write info to setgroups: Permission denied
[2025-05-24 08:21:05] #[0m#[91mERROR  : Error while waiting event for user namespace mappings: no event received
[2025-05-24 08:21:05] #[0m
08:31:06 (589891): run_atlas exited; CPU time 0.212494
08:31:06 (589891): app exit status: 0x1
08:31:06 (589891): called boinc_finish(195)

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You asked the same question one year before:
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=5905&postid=50249

And the answer is:
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=5905&postid=50253

It worked for me, too.

You are correct that I experienced the same problem on a previous Ubuntu setup, however I didn't remember it.
I have implemented the workaround, and now my Atlas_native workunit is running correctly now.

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