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Open your terminal using Ctrl+Alt+T and type the following commands
##Step 1: Update & Upgrade
sudo apt-get update
sudo apt-get upgrade| httpClient.DefaultRequestHeaders.Authorization = | |
| new AuthenticationHeaderValue( | |
| "Basic", | |
| Convert.ToBase64String( | |
| System.Text.ASCIIEncoding.ASCII.GetBytes( | |
| string.Format("{0}:{1}", username, password)))); |