Bug#818726: dpkg-maintscript-helper failures when upgrading from jessie

[Norbert Preining <preining@logic.at>]

Package: dpkg
Version: 1.18.4
Severity: normal

Hi dpkg maintainers,

I am doing upgrade tests of the texlive package from jessie to sid,
and I see the following output:
  Preparing to unpack .../musixtex_1%3a1.20.ctan20151216-3_all.deb ...
  dpkg-query: package 'musixtex' is not installed
  Use dpkg --info (= dpkg-deb --info) to examine archive files,
  and dpkg --contents (= dpkg-deb --contents) to list their contents.
  Unpacking musixtex (1:1.20.ctan20151216-3) over (1:1.15.ctan20131214-1) ...
what is strange here is that dpkg-query says not installed, but later
unpacking ... over ...

Also, the file
	/etc/texmf/fmt.d/40musixtex.cnf
is not removed then.

The maintainer scripts of musixtex 1:1.20.ctan20151216-3 only contain
calls to dpkg-maintscript-helper:

preinst:
dpkg-maintscript-helper rm_conffile /etc/texmf/updmap.d/20musixtex.cfg 1:0.115-2 -- "$@"
dpkg-maintscript-helper rm_conffile /etc/texmf/fmt.d/40musixtex.cnf 1:1.17.ctan20150601-1~ -- "$@"


and so on. Noting else in the maintainer scripts.

The debian/musixtex.maintscript lists:
  rm_conffile /etc/texmf/updmap.d/20musixtex.cfg 1:0.115-2
  rm_conffile /etc/texmf/fmt.d/40musixtex.cnf 1:1.17.ctan20150601-1~


Thanks for any input.

Norbert


-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (200, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.5.0 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages dpkg depends on:
ii  libbz2-1.0   1.0.6-8
ii  libc6        2.22-3
ii  liblzma5     5.1.1alpha+20120614-2.1
ii  libselinux1  2.4-3+b1
ii  tar          1.28-2.1
ii  zlib1g       1:1.2.8.dfsg-2+b1

dpkg recommends no packages.

Versions of packages dpkg suggests:
ii  apt  1.2.7

-- no debconf information