@shubhammahawar, it looks like you have connection errors that are preventing the $ apt-get update command from running:
Unable to connect to 10.0.2.17
Could you check the connection and see if that allows you to run $ apt-get update and proceed with the Dradis install? I know we’re separately troubleshooting the Windows install in your other thread but I wanted to drop this information in here in case it was helpful.