Access my Ubuntu Server remotely in secure manner for some maintenances by installing SSH server. OpenSSH is a FREE version of the SSH connectivity tools that technical users of the Internet rely on. Users of telnet, rlogin, and ftp may not realize that their password is transmitted across the Internet unencrypted, but it is. OpenSSH encrypts all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and other attacks. Additionally, OpenSSH provides secure tunneling capabilities and several authentication methods, and supports all SSH protocol versions.

$ sudo apt-get install openssh-server

This will complete the installation. You can also install the openssh-client to your remote PC as well.

$sudo apt-get install openssh-client

Now,

$ sudo /etc/init.d/ssh start

to start(or restart) the service.

Note: Copy Files Securely over network using SCP

Usage: scp [[user@]host1:]file1 … [[user@]host2:]file2

To copy a file to a remote machine use the following command,

scp /path/file user@remotehost:/path/destination

If you need to copy from the remote host to the local host,

scp user@remotehost:/path/file /path/to/destination

if you need to copy an entire directory full of files to a remote location, use the -r argument

scp -r /path/directory/ user@remotehost:/path/destination/