/usr/share/glib-2.0/schemas/org.gnome.gthumb.file-manager.gschema.xml is in gthumb-data 3:3.3.1.is.3.2.7-0ubuntu1.
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 12 13 14 15 16 | <?xml version="1.0" encoding="UTF-8"?>
<schemalist>
<schema path="/org/gnome/gthumb/file-manager/" id="org.gnome.gthumb.file-manager">
<key type="s" name="last-folder">
<default>''</default>
</key>
<key type="b" name="view-destination">
<default>true</default>
</key>
<key type="as" name="copy-destination-history">
<default>[]</default>
</key>
</schema>
</schemalist>
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