One of the not-much-advertised featues of the new Creators update for Windows 10 is the support for Ubuntu 16.04 in Windows Subsytem for Linux (WSL). The catch is, if you installed the WSL prior to upgrading Windows, it will not upgrade it for you, and leave it as Ubuntu 14.04.
If you want the latest LTS Ubuntu, one option is delete the WSL and reinstall using (in powershell):
This, however will delete all your linux settings / files under WSL, which may be an inconvenience. A less destructive option is to just use (in bash):
Which works surprisingly well, and doesn’t take too long to complete on a modern system. See for yourself:
libinotify now works and so does
jekyll --watch (more info)