/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/ is in empathy-common 3.8.6-0ubuntu9.
This file is owned by root:root, with mode 0o755.
..
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/Info.plist
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/Resources/
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/Resources/Incoming/
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/Resources/Incoming/Content.html
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/Resources/Incoming/NextContent.html
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/Resources/Status.html
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/Resources/Variants/
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/Resources/Variants/Blue.css
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/Resources/Variants/Clean.css
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/Resources/Variants/Simple.css
/usr/share/adium/message-styles/Boxes.AdiumMessageStyle/Contents/Resources/main.css