Install appdata files to /usr/share/metainfo

[sidt4]

$ apt-file search /usr/share/appdata/
etm: /usr/share/appdata/etm.appdata.xml

...

• Refer: https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#spec-component-location
• Refer: https://appstream.debian.org/sid/main/issues/etm.html
• Refer: https://appstream.debian.org/sid/main/metainfo/etm.html

[sidt4]

Notes:

• Use appstreamcli validate ( and not the deprecated appstream-util validate ) command to validate appstream metainfo files.
• The metainfo link above contains fallback appdata generated from .desktop file ( if the appdata in not installed in /usr/share/metainfo/ )