A couple for months ago I finally clicked the the "Upgrade" button which had been appearing for quite some time on my update notifications in Xubuntu 14.04. After about an hour a notification appeared stating that the upgrade had completed and a restart was required. When I restarted the computer a Grub menu appeared with 16.04 as the primary option and some options for safe mode and memory test. 14.04 never had a Grub menu and it started straight away when the power button was pushed. There are no other distributions on the computer and 16.04 works fine but would like to get rid of the Grub menu. Is this possible and if so how would I do this? Thanks for your help.

Have a look at how to clean up the boot menu here If you only have the one operating system it should automatically default to it. But if not you can set the default boot option and grub timeout in /etc/default/grub. Just remember to update-grub

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Thanks for your help Ezekiel Project. I set the timeout to zero in /etc/default/grub and ran update-grub so now the computer boots directly into Xubuntu. Upon reading your linked article, I'll go back later and remove all but the 2 most recent kernels.

Awesome. Enjoy!