(Reading database ... 46602 files and directories currently installed.)
Preparing to unpack .../nginx_1.9.9-1~trusty_amd64.deb ...
Unpacking nginx (1.9.9-1~trusty) over (1.4.6-1ubuntu3.1) ...
dpkg: error processing archive /var/cache/apt/archives/nginx_1.9.9-1~trusty_amd64.deb (--unpack):
 trying to overwrite '/usr/share/nginx/html/index.html', which is also in package nginx-common 1.4.6-1ubuntu3.1
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/nginx_1.9.9-1~trusty_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)