Cannot install Kinivo BTH220 bluetooth headset in ubuntu 15.10

[Grizzly]

Saturday, May 28, 2016  at 14:49, Donald Parsons wrote:
Re: Cannot install Kinivo BTH220 bl (at least in part)

>Unfortunately when I installed the 15.10 I said no to the offer to uprgade
>to 16.04
>Now when I use sudo update-manager -d it does not offer to upgrade to 16.04
>How can I  restore this?

maybe (I've only used this rarely so could be wrong)

sudo do-release-upgrade