1 - i have a frequent diconnection on internet after 2,3 min in ubuntu when i use the inbuilt pppoe dial this i very frustrating

2 - how do make shortcut on the desktop for the dialer like the rasdial in windows i have to type commands in the terminal

The question is do you want to attack the problem with the reconnecting tool or do you wish to attack it head on and figure out why it's dropping every 3 minutes.

You can use a cronjob to check for a dropped connection, but if you loose it every 3 minutes, that might not be a great solution.

You could try to implement this method: click
And set the crontime to 1 minute, but it will remain shaky.

So if I were you, I would try to figure out what's wrong with my connection. Is it wireless?

Questions, Questions...

for 1 - try disabling ipv6 on ubuntu
for 2 - first right click and "create shortcut" , then move shortcut to desktop

hope helps