Bug#915557: libx11-xcb1: changelog.Debian.gz is not deleted when removing packag so next install fails

[Jens Getreu <getreu@web.de>]

Package: libx11-xcb1
Version: 2:1.6.4-3+deb9u1
Severity: important

Dear Maintainer,


* What led up to the situation?

My installation of `wine` failed because, the installation of `libx11-xcb1`
failed.


```
Unpacking libx11-xcb1:i386 (2:1.6.4-3+deb9u1) ...
dpkg: error processing archive /tmp/apt-dpkg-
install-1cFjeB/052-libx11-xcb1_2%3a1.6.4-3+deb9u1_i386.deb (--unpack):
 trying to overwrite shared '/usr/share/doc/libx11-xcb1/changelog.Debian.gz',
which is different from other instances of package libx11-xcb1:i386
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Selecting previously unselected package libxi6:i386.
```


* What was the outcome of this action?

My package database became unstable.



* What outcome did you expect instead?

Install without error.



* Workaround?

   rm /usr/share/doc/libx11-xcb1/changelog.Debian.gz

before installing helped.

I assume it was not properly removed from the previous install and this
prevented the new install (see error message above).



-- System Information:
Debian Release: 9.6
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.18.0-0.bpo.1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libx11-xcb1 depends on:
ii  libc6  2.24-11+deb9u3

libx11-xcb1 recommends no packages.

libx11-xcb1 suggests no packages.