How to import Certificate Authority in Ubuntu

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How to download Computerisms Certificate Authority

  • Open your preferred browser and navigate to:
        http://help.computerisms.ca
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  • Scroll down and Click on "The Certificate Warnings Issue"
  • Under the FAQ section right click on the first link and click on "Save Link As"


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  • Important step!! Change the file name in the top bar from Computerisms.Root.Certificate.pem to Computerisms.Root.Certificate.crt


  • Save the file on your Desktop
    • Note: you can save the file anywhere you wish but a couple of the following commands in the terminal will not work without changing the path in the command. It is recommended to save it on your Desktop


  • Click on save

How to install Computerisms Certificate Authority into your Ubuntu Operation System


  • Press Ctrl+Alt+t to open a terminal window
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  • copy and paste the following line to your terminal:
sudo cp Desktop/Computerisms.Root.Certificate.crt /usr/local/share/ca-certificates


  • Enter your password (Use the same password that you use to login to your computer or install programs) and press Enter
  • Copy and paste or type the following command into your terminal
sudo update-ca-certificates
  • Make sure that the output of the command contains "1 added", as shown in the image to the right
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How To import Certificate Authority into Google Chrome browser

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  • To add the certificate to Google Chrome, start by opening google chrome


  • Open the top right menu bar and click on Settings
  • Search for cert in the top right corner search bar


  • Click on Manage Certificates
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  • Click the Authorities section tab


  • Click on import
  • Navigate to the Desktop and select the file named Computerisms.Root.Certificate.crt


  • Click on open
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  • Check all the options and click on OK


  • Note that the last option, "Trust this certificate for identifying software makers", is not required. You may leave this unchecked, but the other 2 options are required.

How To import Certificate Authority into Firefox browser


  • To add the certificate to Firefox, start by opening Firefox


  • Click on the Edit tab in the top menu bar, and click on Preferences
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  • Click on Advance in the left menu bar


  • Select the Certificates tab in the top menu bar


  • Click on View Certificates
  • Click the Authorities section tab


  • Click the Import button
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  • Navigate to the Desktop and select the file named Computerisms.Root.Certificate.crt


  • Click on open
  • Check all the options and click on OK


  • Note that the last option, "Trust this certificate for identifying software makers", is not required. You may leave this unchecked, but the other 2 options are required.
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How To import Certificate Authority into Thunderbird mail client

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  • To add the certificate to Thunderbird, start by opening Thunderbird


  • Click on the Edit tab in the top menu bar, and click on Preferences
  • Click on Advance in the top menu bar


  • Select the Certificates tab in the top menu bar


  • Click on View Certificates
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  • Click the Authorities section tab


  • Click the Import button
  • Navigate to the Desktop and select the file named Computerisms.Root.Certificate.crt


  • Click on open
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  • Check all the options and click on OK


  • Note that the last option, "Trust this certificate for identifying software makers", is not required. You may leave this unchecked, but the other 2 options are required.