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Most likely to identify who created the key. It is just a comment. But as said at 1: probably so you know you created it. Useful when more than 1 administrator is administrating the system. Yes, you can add anything in place of your e-mail. And since it is the last part of it you do not have to use anything special for spaces etc. Extra: ssh-keygen -c to ...


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Explanation Behind common-auth If you're just looking for a quick fix, go below to How to Configure common-auth to Lock Out. Hopefully this will help bring some sense into how /etc/pam.d/common-auth configures lockout. If you take out all the comments in /etc/pam.d/common-auth, you are left with the following: auth [success=1 default=ignore] ...


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This link may help answer your question in regards to the error message of "Too many authentication failures" superuser.com: Too many authentication failures for username Per the manpage for ssh-keygen, the ssh-keygen -R command: Removes all keys belonging to hostname from a known_hosts file So keys are removed are those from ssh-servers that are ...


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Authenticate in the Software Center with the same user password that you use to login to Ubuntu. Or just press Enter if you haven't set a user password yet, but if you haven't got a user password you should set a strong user password to keep your operating system secure.


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If you haven't changed anything manually, the password should be the same one you use to log on to your account. You must have root rights otherwise you cannot install anything on a Linux system. Disabling that password is definitely not recommended.



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