1. 去这里下载lightworks：http://down.tech.sina.com.cn/page/61988.html
2. 去这里下载libtiff4依赖包：http://security.ubuntu.com/ubuntu/pool/main/t/tiff/libtiff4_3.9.5-2ubuntu1.6_amd64.deb
3. 或者/etc/apt/sources.list 文件中添加一行：deb http://security.ubuntu.com/ubuntu precise-security main
4. ok

ubuntu 14.04 64位安装 lightworks (解决libtiff4依赖)