Install Ubuntu's squashfs-tools so the stock unsquashfs/mksquashfs exist next to sasquatch. As the non-root container user, unsquashfs and sasquatch can't restore security.* xattrs and exit 2 although every file was extracted; wrap them to pass -no-xattrs unless an xattr option is given. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>