All good now:
$ ls -l /usr/share/glib-2.0/schemas/org.gnome.mutter.x11.gschema.xml -rw-r--r-- 1 root root 1117 Mar 31 01:09 /usr/share/glib-2.0/schemas/org.gnome.mutter.x11.gschema.xml
$ dpkg-query -S org.gnome.mutter.x11 magpie-common: /usr/share/glib-2.0/schemas/org.gnome.mutter.x11.gschema.xml
All good now:
$ ls -l /usr/share/ glib-2. 0/schemas/ org.gnome. mutter. x11.gschema. xml glib-2. 0/schemas/ org.gnome. mutter. x11.gschema. xml
-rw-r--r-- 1 root root 1117 Mar 31 01:09 /usr/share/
$ dpkg-query -S org.gnome. mutter. x11 glib-2. 0/schemas/ org.gnome. mutter. x11.gschema. xml
magpie-common: /usr/share/