When I try to Download Heartbeat 6.3.1 and install it, system shows like this.I didn't get it.Please reply.
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package heartbeat-6.3.1-amd64
E: Couldn't find any package by glob 'heartbeat-6.3.1-amd64'
E: Couldn't find any package by regex 'heartbeat-6.3.1-amd64'