Installation try out

I am following the installation guide and this line

python3 -m venv env

created an error as venv was not installed guess this is missing:

apt-get install python3-venv

than I created the cluster and tried to install stackspin by using:

python -m stackspin stackspin.hapee.org install

but that failed:

PLAY [Pre-configure hosts] ************************************************************************************************************************************

TASK [Gathering Facts] ****************************************************************************************************************************************
Monday 28 February 2022  16:16:33 +0000 (0:00:00.327)       0:00:00.743 ******* 
fatal: [stackspin.hapee.org]: UNREACHABLE! => changed=false 
  msg: Host key checking is enabled, and SSH reported an unrecognized or mismatching host key.
  unreachable: true

PLAY RECAP ****************************************************************************************************************************************************
stackspin.hapee.org        : ok=2    changed=0    unreachable=1    failed=0    skipped=0    rescued=0    ignored=0   

but the machine is reachable:

PING stackspin.hapee.org (37.218.241.243) 56(84) bytes of data.  
64 bytes from 37.218.241.243 (37.218.241.243): icmp_seq=1 ttl=64 time=0.073 ms  
64 bytes from 37.218.241.243 (37.218.241.243): icmp_seq=2 ttl=64 time=0.070 ms  
64 bytes from 37.218.241.243 (37.218.241.243): icmp_seq=3 ttl=64 time=0.054 ms