libbrasero-media3-dev is declared Multi-Arch: same, but fails to
coinstall.

The files
 * /usr/share/gtk-doc/html/libbrasero-burn/annotation-glossary.html
 * /usr/share/gtk-doc/html/libbrasero-burn/api-index-full.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroBlankDialog.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroBurn.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroBurnDialog.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroBurnOptions.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroBurnSession.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroSessionCfg.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroSessionSpan.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroSumDialog.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroToolDialog.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroTrack.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroTrackDisc.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroTrackImage.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroTrackImageCfg.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroTrackStream.html
 * /usr/share/gtk-doc/html/libbrasero-burn/BraseroTrackStreamCfg.html
 * /usr/share/gtk-doc/html/libbrasero-burn/ch01.html
 * /usr/share/gtk-doc/html/libbrasero-burn/index.html
 * /usr/share/gtk-doc/html/libbrasero-burn/libbrasero-burn-brasero-burn-lib.html
 * /usr/share/gtk-doc/html/libbrasero-burn/libbrasero-burn-brasero-enums.html
 * /usr/share/gtk-doc/html/libbrasero-burn/libbrasero-burn-brasero-error.html
 * /usr/share/gtk-doc/html/libbrasero-burn/libbrasero-burn-brasero-status.html
 * /usr/share/gtk-doc/html/libbrasero-burn/libbrasero-burn-brasero-tags.html
 * /usr/share/gtk-doc/html/libbrasero-burn/libbrasero-burn-brasero-track-data-cfg.html
 * /usr/share/gtk-doc/html/libbrasero-burn/libbrasero-burn-brasero-track-data.html
 * /usr/share/gtk-doc/html/libbrasero-burn/libbrasero-burn-brasero-track-type.html
 * /usr/share/gtk-doc/html/libbrasero-media/annotation-glossary.html
 * /usr/share/gtk-doc/html/libbrasero-media/api-index-full.html
 * /usr/share/gtk-doc/html/libbrasero-media/BraseroMedium.html
 * /usr/share/gtk-doc/html/libbrasero-media/BraseroMediumMonitor.html
 * /usr/share/gtk-doc/html/libbrasero-media/BraseroVolume.html
 * /usr/share/gtk-doc/html/libbrasero-media/ch01.html
 * /usr/share/gtk-doc/html/libbrasero-media/index.html
 * /usr/share/gtk-doc/html/libbrasero-media/libbrasero-media-brasero-drive.html
 * /usr/share/gtk-doc/html/libbrasero-media/libbrasero-media-brasero-media.html
 * /usr/share/gtk-doc/html/libbrasero-media/libbrasero-media-brasero-units.html
 * /usr/share/gtk-doc/html/libbrasero-media/libbrasero-media-BraseroDriveSelection.html
 * /usr/share/gtk-doc/html/libbrasero-media/libbrasero-media-BraseroMediumSelection.html
are shared by libbrasero-media3-dev version 3.12.4-1 as present in
forky|unstable with varying content.

Please ensure that shared files have bit-identical content across
architectures, move architecture-dependent files to
architecture-dependent paths or remove the Multi-Arch: same field.

Kind regards

Helmut Grohne