The procedure to install a ssh server in Ubuntu Linux is as follows:
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Open the terminal application for Ubuntu desktop.
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For remote Ubuntu server you must use BMC or KVM or IPMI tool to get console access
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Type sudo apt-get install openssh-server
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Enable the ssh service by typing sudo systemctl enable ssh
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Start the ssh service by typing sudo systemctl start ssh
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Test it by login into the system using ssh user@server-name