If you deploy a virtual machine in Azure, in the wizard you'll specify a user, which will be created by the Azure Agent in the virtual machine—for instance, if you deploy a virtual machine with PowerShell:
You can use this account to log in. It's a normal user, also called an unprivileged user, which doesn't have administrative privileges. To gain administrative privileges you need the sudo command; sudo means: do as su, referring to the su command. Without parameters, the su command switches your current user to another user, root—the administrator account in Linux.
If you want root privileges, in some of the Linux images ...
