Is there any way to open the desktop display from terminal(ssh login)?
You can use the
Then you can
To use Xephyr :
Start a Xephyr session
Set your $DISPLAY (assuming Xephyr is on :1)
ssh in to your server and start kde
If you are using ssh, be sure to understand the security risk, and I personally advise you use keys and disable password authentication.
If you want an entire desktop I would suggest FreeNX. FreeNX is both fast and secure.
If you're just talking about running a graphical application from the terminal, you can specify the
Or if you want it to persist you can export it to remain part of your bash session:
You cannot run Desktop display or GUI from ssh. if you want to see the Desktop or GUI, i would suggest to use rdp or Remote Desktop application in ubuntu.