Comment 5 for bug 1987958

Still present on Xubuntu Mantic 230917.

The Xfce Thunar docs have instructions on how to trust the executable:
https://docs.xfce.org/xfce/thunar/custom-actions#trust_multiple_desktop_files_at_once

For multiple files:
for f in %F; do sha256sum "$f" | awk '{print $1}' | xargs gio set "$f" metadata::xfce-exe-checksum && chmod +x "$f"; done

Just for ubiquity.desktop:
gio set ubiquity.desktop metadata::xfce-exe-checksum `sha256sum ubiquity.desktop | awk '{print $1}'`

After running this command, I can verify that the launcher is now trusted.

Is this something that can be added to Ubiquity, or should we make this part of Xubuntu's live session startup?