missing user and group names in chroot – need these files
is user in /etc/passwd and /etc/group?

Are these files inside the jail?
/etc/nsswitch.conf
/lib/i386-linux-gnu/libnss_files.so.2
/lib/i386-linux-gnu/libnss_nis.so.2
/lib/i386-linux-gnu/libnsl.so.1
/lib/i386-linux-gnu/libnss_compat.so.2
/lib/i386-linux-gnu/libattr.so.1
/lib/i386-linux-gnu/libpthread.so.0