Default Linux system user account:
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For Amazon Linux 2** or the Amazon Linux AMI, the user name is ec2-user.
For a CentOS AMI, the user name is centos or ec2-user.
For a Debian AMI, the user name is admin.
For a Fedora AMI, the user name is fedora or ec2-user.
For a RHEL AMI, the user name is ec2-user or root.
For a SUSE AMI, the user name is ec2-user or root.
For an Ubuntu AMI, the user name is ubuntu.
For an Oracle AMI, the user name is ec2-user.
For a Bitnami AMI, the user name is bitnami.
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Otherwise, check with the AMI provider.
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