Binary package “9mount” in ubuntu noble
Plan 9 filesystem (v9fs) user mount utilities
9mount is a set of SUID mounting tools for use with v9fs to help
cope with Linux's poor mount support.
.
The tools offer a level of security - 9mount will only let you
mount over non-sticky directories you have write access to, and
9umount will only let you unmount 9p partitions that you mounted
yourself.