All reports of desktop-entry-contains-unknown-key for the archive. The extended description of this tag is:
The key on this line of the desktop entry is not one of the standard keys defined in the FreeDesktop specification, not one of the legacy KDE keywords, and one that does not begin with X-. It's most likely that the key was misspelled.
The desktop-file-validate tool in the desktop-file-utils package is useful for checking the syntax of desktop entries.
Refer to https://specifications.freedesktop.org/desktop-entry-spec/latest/ar01s06.html for details.
Severity: minor, Certainty: certain
Check: menu-format, Type: binary
Emitted (non-overridden): 1, overridden: 1, total: 2
The package names link to the relevant maintainer page and the corresponding report for the source package. The links go to the full maintainer report page, which includes info and experimental tags and overridden tags, rather than the default page that shows only errors and warnings.
matchbox-panel-manager 0.1-8 (binary) (Moray Allan <firstname.lastname@example.org>)
- usr/share/applications/mb-panel-manager.desktop:9 SingleInstance [amd64, i386]
nemo 3.8.5-1+b1 (binary) (Debian Cinnamon Team <email@example.com>) overridden
- O usr/share/applications/nemo-autostart.desktop:7 AutostartCondition [amd64, i386]