error while loading shared libraries: libpthread.so.0
 

I created chroot setup in redhat8 (32-bit OS) and bundled the chroot setup as a zip. Then extracted the bundle in ubuntu flavor(64-bit OS). Then copied the necessary local files like '/etc/passwd', '/etc/group', host, host.conf etc.., in to the CHROOT setup and tried running the apache in the chroot jail by the command '/usr/sbin/chroot /CHROOT/ /apache/bin/httpd -k start'. But this failed with the below error

/apache/bin/httpd: error while loading shared libraries: libpthread.so.0: cannot open shared object file: No such file or directory

Can any one know why this error occurs. Any idea?

did you copy over the required library files for apache?
also did you copy over apache from the redhat server or did you copy the ubuntu one?

if you need a list of them all run ldd httpd