This problem exhibits itself when viewing css files with @media {…} queries with Kate text editor versions < v3.14. Kate highlights these sections incorrectly with red underline or similar.
The fix for this bug is to add <DetectSpaces/> to the MQEV context of Kate’s css.xml highlighting file so that it parses spaces after @media attribute and before the curly brace correctly.
In Kubuntu 14.04 css.xml is located in /usr/share/kde4/apps/katepart/syntax/css.xml
Edit this file with Kate as follows
kdesudo kate /usr/share/kde4/apps/katepart/syntax/css.xml
Find the second occurrence of “MQEV”

in the Windows notification area. This is to the right of the Taskbar at the bottom right of the screen. If not visible click on the arrow head to the left of the notification area to reveal hidden icons. Right-click on the Avast icon and select Open Avast UI.