yes. So that the i-mscp installer will install the mysql server itself.
Or what do you think should i do?
Sorry, but your question is out of the free support that we provide. As we already said, we are not a school 
See also: https://i-mscp.net/index.php/User/650-Nuxwin/#about
Regarding your problem with the untrusted SSL certificate, this was due to a broken openssl installation. I had to reinstall the openssl package with the DPkg::Options::=--force-confmiss option to force reinstallation of missing files (the /etc/ssl/openssl.cnf file was missing) and reconfigure the ca-certificates package (dpkg-reconfigure ca-certificates). Right now there are no longer untrusted SSL certificate issue.
I've done preinstallation of i-MSCP (build step) and I've removed the MySQL server afterwhile.
You can now rerun the i-MSCP installer as usually.
BTW: Your s3 instance get really slow when some DPKG(1) IO operations are involved... Installing i-MSCP on a s3 server instance is not really recommended.
Thank you very much!
It's running on one of our vSphere hosts (demo environment with very less resources for this vm). Just the server name is s3 
Thank you very much!
You're welcome.
Thread closed.
