Change Home directory on Ubuntu

Sometimes, people like to create an independent partition for /home. The advantage of this is that the new installation of Ubuntu by erasing the old copy can save the home folder. In general, personal stuff is stored in this folder. So all personal stuff can be saved in this way. The only trouble is one has to change the home directory after each new installation. Please refer to the following link for howto.
Change home directory.
Or copy the link (https://help.ubuntu.com/community/Partitioning/Home/Moving)

Change Grub background

Find a png format picture, copy it to grub folder using the following command:
sudo cp yourpic.png /boot/grub/background.png
then update grub file:
sudo update-grub

Restart your computer and find that the background has already been changed.
Note the picture must be in png format.

Ubuntu connect to server

On Ubuntu, one can easily connect to a server and download/upload file via SSH. First, one should open the connect to server window. This can be done by two ways.  Press Alt+F2 and search for "nautilus-connect-server", or open any folder by the file manager and use the menu File>Connect to server.  Both ways can open the connect to server window. In this window, at the Server address input box, type
ssh://username@serveraddress:port/folder
Here replace the username, serveraddress, port and folder with real ones. Then click connect to link to the server. After connection is established, one can mange files in server just like those in local folders. Note the ":port"part is optional.