how to remove crossplatformui

1. Enter /var/lib/dpkg/info

   cd /var/lib/dpkg/info  

2. Delete all entry related to crossplatformui

   sudo rm crossplatformui.*  

3. Force remove crossplatformui

   sudo dpkg --remove --force-remove-reinstreq crossplatformui    (Reading database ...   dpkg: warning: files list file for package `crossplatformui' missing, assuming package has no files currently installed.    (Reading database ... 159448 files and directories currently installed.)    Removing crossplatformui ... 
   

Source: http://askubuntu.com/questions/136423/crossplatformui-error