This is a common issue for who are very new to Linux environment. Itversity labs build on Linux machines. So the nature of Linux is we cant see the password what we type.
If you are using the Web console in Itversity big data labs, We are providing username and password in the console as Icons. If you click on User icon the username will be copied in to buffer then you can paste using Shift+Insert. In the same way, You have to click on password icon and paste on the console.
When you are pasting the username and password you have to make sure that cursor on console is filled/bold. If not just click on the console once then paste the credentials.
We are describing this with respective Chrome browser.
PFA for reference to our web console
Common issues we encounter on our state of the art Big Data Cluster with Hadoop, Spark and many others - https://labs.itversity.com