Bionic net installer on ppc64el fails, can't chroot to target

[Jeremy Kerr]

When attempting a netboot install on bionic, it fails during base system install, with the message:

. │ │ Debootstrap warning │ │
. │ │ Warning: Failure trying to run: chroot /target dpkg-deb -f │ │
. │ │ /var/cache/apt/archives/dpkg_1.19.0.4ubuntu1_ppc64el.deb Version │ │

Trying to run anything in the chroot at /target/ fails:

  ~ # chroot /target /bin/bash
  chroot: can't execute '/bin/bash': No such file or directory
  ~ # ls -l /target/bin/bash
  -rwxr-xr-x 1 root root 1544376 May 17 2017 /target/bin/bash

... which looks like a missing dynamic linker:

  $ readelf -l bash | grep interpreter
      [Requesting program interpreter: /lib64/ld64.so.2]

  ~ # ls -l /target/lib64/ld64.so.2
  ls: /target/lib64/ld64.so.2: No such file or directory
  ~ # ls -la /target/lib64/
  drwxr-xr-x 2 root root 4096 Oct 11 20:21 .
  drwxr-xr-x 20 root root 4096 May 23 2017 ..

The syslog seems to indicate that the installer failed to untar a symlink:

  Dec 12 05:17:36 debootstrap: tar: skipping unsafe symlink to '/lib/powerpc64le-linux-gnu/ld-2.26.so' in archive, set EXTRACT_UNSAFE_SYMLINKS=1 to extract

I've attached a script to reproduce the issue in qemu. I can provide the full syslog if you need it.

[Frank Heimes (fheimes)]

it looks like this is a duplicate of:
https://bugs.launchpad.net/ubuntu/+source/busybox/+bug/1737662