su: Authentication failure

Posted by user166999 on Ask Ubuntu See other posts from Ask Ubuntu or by user166999
Published on 2013-07-02T21:18:42Z Indexed on 2013/07/02 23:18 UTC
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su

I have downloaded the Eset Nod32 Antivirus from its website, and I got a eset_nod32av_64bit_en.linux file. I have right-clicked on it, Properties - Permissions, and checked the Allow executing file as program option. Then I was able to run the program. The Installer starts and it asks for my root password. I enter it correctly, but then I get the following error message: "su: Authentication failure". What can I do with this to install the Nod32?

Thanks!

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