/usr/share/help/sv/ubuntu-help/mouse.page is in ubuntu-docs 16.04.3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/help/sv/ubuntu-help/../../../help-langpack/sv/ubuntu-help/mouse.page
/usr/share/help/sv/ubuntu-help/../../../help-langpack/sv/ubuntu-help/mouse.page