/usr/share/mime/ is in qgis 2.8.6+dfsg-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/mime/packages/
/usr/share/mime/packages/qgis.xml
/usr/share/mimelnk/application/
/usr/share/mimelnk/application/x-adobe-mif.desktop
/usr/share/mimelnk/application/x-esri-crs.desktop
/usr/share/mimelnk/application/x-esri-shape.desktop
/usr/share/mimelnk/application/x-mapinfo-mif.desktop
/usr/share/mimelnk/application/x-qgis-layer-settings.desktop
/usr/share/mimelnk/application/x-qgis-project.desktop
/usr/share/mimelnk/application/x-raster-aig.desktop
/usr/share/mimelnk/application/x-raster-ecw.desktop
/usr/share/mimelnk/application/x-raster-mrsid.desktop