/usr/share/roundcube/plugins/sauserprefs/ is in roundcube-plugins-extra 0.6-20111030.
This file is owned by root:root, with mode 0o755.
..
/usr/share/roundcube/plugins/sauserprefs/config.inc.php
/usr/share/roundcube/plugins/sauserprefs/config.inc.php.dist
/usr/share/roundcube/plugins/sauserprefs/localization/
/usr/share/roundcube/plugins/sauserprefs/localization/de_CH.inc
/usr/share/roundcube/plugins/sauserprefs/localization/de_DE.inc
/usr/share/roundcube/plugins/sauserprefs/localization/en_GB.inc
/usr/share/roundcube/plugins/sauserprefs/localization/en_US.inc
/usr/share/roundcube/plugins/sauserprefs/localization/es_ES.inc
/usr/share/roundcube/plugins/sauserprefs/localization/fr_FR.inc
/usr/share/roundcube/plugins/sauserprefs/localization/gl_ES.inc
/usr/share/roundcube/plugins/sauserprefs/localization/hu_HU.inc
/usr/share/roundcube/plugins/sauserprefs/localization/it_IT.inc
/usr/share/roundcube/plugins/sauserprefs/localization/pl_PL.inc
/usr/share/roundcube/plugins/sauserprefs/localization/pt_BR.inc
/usr/share/roundcube/plugins/sauserprefs/localization/ro_RO.inc
/usr/share/roundcube/plugins/sauserprefs/localization/ru_RU.inc
/usr/share/roundcube/plugins/sauserprefs/localization/sk_SK.inc
/usr/share/roundcube/plugins/sauserprefs/localization/sv_SE.inc
/usr/share/roundcube/plugins/sauserprefs/sauserprefs.js
/usr/share/roundcube/plugins/sauserprefs/sauserprefs.php
/usr/share/roundcube/plugins/sauserprefs/skins/
/usr/share/roundcube/plugins/sauserprefs/skins/default/
/usr/share/roundcube/plugins/sauserprefs/skins/default/help.gif
/usr/share/roundcube/plugins/sauserprefs/skins/default/icons.gif
/usr/share/roundcube/plugins/sauserprefs/skins/default/icons.png
/usr/share/roundcube/plugins/sauserprefs/skins/default/ie6hacks.css
/usr/share/roundcube/plugins/sauserprefs/skins/default/iehacks.css
/usr/share/roundcube/plugins/sauserprefs/skins/default/safari.css
/usr/share/roundcube/plugins/sauserprefs/skins/default/sauserprefs.css
/usr/share/roundcube/plugins/sauserprefs/skins/default/templates/
/usr/share/roundcube/plugins/sauserprefs/skins/default/templates/sauserprefs.html
/usr/share/roundcube/plugins/sauserprefs/skins/default/templates/settingsedit.html