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JailShell permission block: setting setuid bit failed on Ubuntu 24.04

POSTED BY: sysadmin_joe ELITE_CONTRIBUTOR POSTED ON: Jun 03, 2026 CATEGORY: GENERAL

I am getting ssh connection issues for users inside the bubblewrap container. The error trace states: 'setting setuid bit failed: Operation not permitted'. I verified that bubblewrap (bwrap) is installed.

13 Total Upvotes

REPLIES (2)

linux_kernel_guy ACTIVE_MEMBER SOLUTION_ACCEPTED 2026.06.04 10:50

Ubuntu 24.04 has stricter unprivileged user namespace restrictions. You need to enable setuid bit on the bubblewrap binary. Run 'sudo chmod u+s /usr/bin/bwrap' on the host server.

sysadmin_joe ELITE_CONTRIBUTOR [AUTHOR] 2026.06.05 10:50

That worked like a charm! Adding 'chmod u+s /usr/bin/bwrap' solved the ssh connection issue immediately. Thank you!

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