I am not sure if there is any good way using native bluetooth app that ships with ubuntu but I am going to use a pretty old app called blueman.
install it using
sudo apt-get install blueman
Now from untity search for blueman and you will get bluetooth manager click on that and you will get window and blueman service will be enabled.
now you can see two bluetooth icons on top panel of unity. one will be native and other will be blueman’s
click on blueman’s icon and click local services.
Now a new window Local Services pops up, in it click on ‘network’ and enable Network Access point, click apply and save it.
步骤：
Ubuntu电脑端设置
1、安装blueman
sudo apt-get install blueman
2、安装完成之后，在termanl中，执行
blueman-services
会出现下图界面
到此电脑端的设置就完成了，接下来是手机
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