Dear Maintainer,
Debian stable disables unprivileged user namespaces by default.
QtWebEngine sandbox requires user namespaces, making official
kiwix-desktop unusable out of the box.
The only working workaround: export QTWEBENGINE_DISABLE_SANDBOX=1
Please fix this in Debian packaging: Either set this env var in the
official .desktop file, or add a sandbox patch like chromium.
Debian's chromium-browser has sandbox downgrade patches, but
kiwix-desktop is shipped raw without adaptation, resulting in broken
software for default installations.