Also, please refresh your apt information with `apt-get update`; there was a recent upload of nginx 1.9.10-1ubuntu1 which addresses security issues as well as other fixes, and it is necessary to test that version rather than the older 1.9.9-1ubuntu1 which you are attempting to install.
Also, please refresh your apt information with `apt-get update`; there was a recent upload of nginx 1.9.10-1ubuntu1 which addresses security issues as well as other fixes, and it is necessary to test that version rather than the older 1.9.9-1ubuntu1 which you are attempting to install.