Bug#995568: Upgrade fails

[Nigel Horne <njh@bandsman.co.uk>]

Package: x11proto-dev
Version: 2021.5-1

Package fails to upgrade:

# apt upgrade
Reading package lists... Done
Building dependency tree        
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 libxau-dev : Depends: x11proto-dev but it is not installed
 libxdamage-dev : Depends: x11proto-dev but it is not installed
 libxext-dev : Depends: x11proto-dev but it is not installed
 libxfixes-dev : Depends: x11proto-dev but it is not installed
 x11proto-core-dev : Depends: x11proto-dev but it is not installed
 x11proto-dri2-dev : Depends: x11proto-dev but it is not installed
 x11proto-gl-dev : Depends: x11proto-dev but it is not installed
 x11proto-input-dev : Depends: x11proto-dev but it is not installed
 x11proto-kb-dev : Depends: x11proto-dev but it is not installed
 x11proto-xext-dev : Depends: x11proto-dev but it is not installed
 x11proto-xf86vidmode-dev : Depends: x11proto-dev but it is not installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
root@netgate2:/home/njh# apt --fix-broken install
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  gnupg-l10n libblas-common libexporter-lite-perl libfile-copy-recursive-perl
  libgfortran3 libglew2.0 libio-capture-perl libncurses5-dev
  libnetwork-ipv4addr-perl libset-scalar-perl libstrictures-perl libxcb-util0
  ruby-nokogiri ruby-pkg-config ruby-rgen ruby-safe-yaml x11proto-damage-dev
  x11proto-fixes-dev x11proto-xext-dev
Use 'apt autoremove' to remove them.
The following additional packages will be installed:
  x11proto-dev
The following NEW packages will be installed:
  x11proto-dev
0 upgraded, 1 newly installed, 0 to remove and 483 not upgraded.
677 not fully installed or removed.
Need to get 0 B/599 kB of archives.
After this operation, 1,720 kB of additional disk space will be used.
Do you want to continue? [Y/n] 
(Reading database ... 100009 files and directories currently installed.)
Preparing to unpack .../x11proto-dev_2021.5-1_all.deb ...
Unpacking x11proto-dev (2021.5-1) ...
dpkg: error processing archive /var/cache/apt/archives/x11proto-dev_2021.5-1_all.deb (--unpack):
 trying to overwrite '/usr/include/X11/extensions/damageproto.h', which is also in package x11proto-damage-dev 1:1.2.1-2
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/x11proto-dev_2021.5-1_all.deb
needrestart is being skipped since dpkg has failed
E: Sub-process /usr/bin/dpkg returned an error code (1)