The UX305 is an ultrabook that can run Linux (google for discussion). So I bought a couple when the Canadian Microsoft Store had a great Boxing Day sale.
(Boxing Day in Canada and the rest of the Commonwealth is a sale day like the US Black Friday. It is the day after Christmas.)
It turns out that the UX305C (or UX305CA -- both names are used to describe this notebook) has a newer processor (Skylake) than the other writeups have covered. This newer processor and support chip cause some problems.
I was able to install Fedora 23 on it, but there were several issues. All serious problems went away when I installed the Rawhide kernel after installing Fedora 23.
While installing, the trackpad won't work. So you should use an external mouse for the installation procedure.
I found that my USB / ethernet dongle would not work during installation. Wireless did work.
After installation and applying all updates, I followed this to install the Rawhide kernel: https://fedoraproject.org/wiki/RawhideKernelNodebug You need to turn off Secure Boot to boot the Rawhide kernel.
Here are relevant bugzilla entries: https://bugzilla.redhat.com/show_bug.cgi?id=1281990 https://bugzilla.redhat.com/show_bug.cgi?id=1292615
Even after this fix, the airplane mode light (in the keycap) is on but I'm not in airplane mode. I haven't tried other Fn-* key combinations: I assume that they are not working. I haven't tried to fix them.
Others have gotten Arch Linux, debian, and Ubuntu working on the UX305C. All due to the work described in bz 1281990.
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D. Hugh Redelmeier