https://cmake.org/install/

Go there, download the CMake source code, make sure you have purged the
previous version, and then build from source. I am guessing you are on
an older version of Ubuntu? 14dotSomething?

There may be a binary for your system.
https://launchpad.net/~george-edison55/+archive/ubuntu/cmake-3.x

There is a PPA for 14, 15, and 16 for the latest CMake as well if you
wanna stay in the Apt ecosystem.

On Sun, Aug 28, 2016 at 10:40:55AM -0400, Michael wrote:
>    Well, apparently I need to run the release candidate of hugin. So I tied
>    installing it and:
>     cmake -DCMAKE_INSTALL_PREFIX=/usr/local -DCPACK_BINARY_DEB:BOOL=ON ../
>    CMake Error at CMakeLists.txt:3 (cmake_minimum_required):
>      CMake 3.1.0 or higher is required.  You are running version 2.8.12.2
>    -- Configuring incomplete, errors occurred!
>    How do I update to 3.1.0 or higher?
>    --
>    :-)~MIKE~(-:

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