sudo dpkg -i nginx-naxsi_1.4.1-1ppa1~lucid_amd64.deb
(Reading database ... 29140 files and directories currently installed.)
Unpacking nginx-naxsi (from nginx-naxsi_1.4.1-1ppa1~lucid_amd64.deb) ...
dpkg: error processing nginx-naxsi_1.4.1-1ppa1~lucid_amd64.deb (--install):
 trying to overwrite '/usr/sbin/nginx', which is also in package nginx 0:1.8.0-1~lucid
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
 nginx-naxsi_1.4.1-1ppa1~lucid_amd64.deb