libiw30t64 fails to install when libiw30 is present, because the
Conflicts field hardcodes a version bound that the installed
libiw30 (e.g. 30~pre9-16+b1) does not satisfy:

  Conflicts: libiw30 (<< 30~pre9)

dpkg --compare-versions "30~pre9-16+b1" ge "30~pre9" is true, so the
conflict never triggers and libiw30t64 tries to overwrite a file still
owned by libiw30:

  dpkg: error processing archive .../libiw30t64_30~pre9-22_amd64.deb
(--unpack):
   trying to overwrite '/usr/lib/x86_64-linux-gnu/libiw.so.30', which is
   also in package libiw30:amd64 (30~pre9-16+b1)

Fix: use unconditional Conflicts/Replaces, since libiw30t64 and libiw30
can never coexist regardless of version:

  Conflicts: libiw30
  Replaces: libiw30

Reported by a user via email after upgrading from testing.

This seems overly broad, especially when we know the last version
that was available before the migration.

Chris

Hi Chris,

Fair point. My reasoning: libiw30 and libiw30t64 ship the identical
file (/usr/lib/x86_64-linux-gnu/libiw.so.30) and can never coexist
under any circumstance, so I don't think there's a future libiw30
version this should ever need to tolerate, unlike a typical soname
bump where reuse of the old name is conceivable.

Simon has already sponsored and uploaded -23 to unstable with the
unversioned form, and it's verified to fix the reported upgrade
failure. If you think bounding it to a specific pre-t64 version is
still the better convention here, I'm glad to prepare a follow-up,
just let me know which version you'd use as the ceiling.

Best regards,
Ahmed Alaoui

We believe that the bug you reported is fixed in the latest version of
wireless-tools, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1143944@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Ahmed Alaoui <ahmedalaoui.debian@gmail.com> (supplier of updated wireless-tools package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 10 Aug 2026 01:43:37 +0100
Source: wireless-tools
Architecture: source
Version: 30~pre9-23
Distribution: unstable
Urgency: medium
Maintainer: Ahmed Alaoui <ahmedalaoui.debian@gmail.com>
Changed-By: Ahmed Alaoui <ahmedalaoui.debian@gmail.com>
Closes: 1143944
Changes:
 wireless-tools (30~pre9-23) unstable; urgency=medium
 .
   * debian/control: Fix libiw30t64 Conflicts/Replaces against libiw30.
     Hardcoded version bound in Conflicts prevented upgrade from
     installed 30~pre9-16+b1, causing file overwrite failure on
     /usr/lib/x86_64-linux-gnu/libiw.so.30. Use unconditional
     Conflicts/Replaces instead, verified in clean container test.
     (Closes: #1143944)
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