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[Magnus Holmgren <holmgren@xxxxxxxxxx>]

There's nothing to fix i nettle. but other packages depending on it need to be rebuilt in order. 
I don't know how Ubuntu manages library transitions like this, but you can have a look at https://release.debian.org/transitions/html/auto-nettle.html (check the "good" box).

What I find strange is that libnettle 6 is installed but not libnettle4;
at least libgnutls-deb0-28 should depend on the latter. Is it already
installed before the build starts?

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https://bugs.launchpad.net/bugs/1463875

Title:
  Crash in libnettle6 on armhf and powerpc archs

Status in nettle package in Ubuntu:
  Confirmed
Status in nettle package in Debian:
  New

Bug description:
  Currently, in wily, some landing silos are blocked now, due to a
  segfault occurring when attempting to run certain test binaries, which
  depend on the gnutls stack. Most notably so far, I've hit this issue
  in projects which are using QtNetwork or libcurl for network access.
  The issue is a crash in libnettle6, with the following stack trace:

  Program received signal SIGSEGV, Segmentation fault.
  0xb6c20b00 in nettle_yarrow256_update ()
     from /usr/lib/arm-linux-gnueabihf/libnettle.so.6
  (gdb) bt
  #0  0xb6c20b00 in nettle_yarrow256_update ()
     from /usr/lib/arm-linux-gnueabihf/libnettle.so.6
  #1  0xb6bd6406 in ?? () from /usr/lib/arm-linux-gnueabihf/libgnutls-deb0.so.28
  Backtrace stopped: previous frame identical to this frame (corrupt stack?)

  There seems to also be no dbgsym package available yet on
  ddebs.ubuntu.com for this package, so I've not been able to get a more
  complete trace.

  This is happening with nettle 3.1.1-3 in wily-proposed.

  Link to build failure in a PPA: https://launchpad.net/~ci-train-ppa-
  service/+archive/ubuntu/landing-022/+build/7526566

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