I have a product, SoftRAID, which installs a command line tool with its corresponding man page for it.
With Catalina, I can no longer copy the man page to /usr/share/man/man1 as I get a "Read-only file system" error. I have tried copying the man page to /Library/Apple/usr/share/man/man1/ but this also produces an error.
The copy operations are being performed with an executable which is running setuid root (i.e. with root privileges).
Thanks,
Tim