/usr/lib/x86_64-linux-gnu/pkgconfig/ubuntu-download-manager-client.pc is in libubuntu-download-manager-client-dev 0.3+14.04.20140321-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include/ubuntu/download_manager
Name: ubuntu-download-manager-client
Description: Client Ubuntu Download Manager lib
Version: 0.3
Libs: -L${libdir} -lubuntu-download-manager-client
Requires: Qt5Core Qt5DBus
Cflags: -I${includedir}
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