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newbie : only one screen terminal after installing devstack

Hi, I am installing devstack on my ubuntu VM. The stack.sh failed many times. Currently, when I try to run ./stack.sh from the devstack directory, the script says

You are already running a stack.sh session. To rejoin this session type 'screen -x stack'. To destroy this session, type './unstack.sh'.

If I attach to the screen I see only two terminals. one is for keystone and not sure what the other is for. On running unstack.sh , I see the following error.

/dev/devstack$ ./unstack.sh * Stopping web server apache2
apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName ... waiting
[ OK ] No screen session found. No screen session found. No screen session found. tgt stop/waiting tgtadm: can't send the request to the tgt daemon, Transport endpoint is not connected tgtd seems to be in a bad state, restarting... stop: Unknown instance: tgt start/running, process 23756 tgt stop/waiting Volume group "stack-volumes" not found Skipping volume group stack-volumes Volume group "stack-volumes" not found
Skipping volume group stack-volumes /home/srijit/dev/devstack/lib/neutron: line 506: 23778 Killed
sudo pkill -9 -f neutron-ns-metadata-proxy kill: No such process

Please let me know, if someone has faced similar issues and the fix applied.

Thanks, Srijit