pkg://x-dev_7.0.12-1_all.deb:12682/control  downloads

Package: x-dev
Source: x11proto-core
Version: 7.0.12-1
Architecture: all
Maintainer: Ubuntu Core Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Debian X Strike Force <debian-x@lists.debian.org>
Installed-Size: 44
Depends: x11proto-core-dev
Section: x11
Priority: optional
Description: dummy package for transition purposes
 This package is a dummy package for transition purposes, and only exists to
 depend on x11proto-core-dev.  You may safely remove it if it will not
 remove other packages.