How to import Certificate Authority in Ubuntu

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How to download Computerisms Certificate Authority

  • Open your preferable browser and navigate to:
        http://help.computerisms.ca
  • 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"


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


  • Save the file on your Desktop(Note that you can save the file anywhere you wish but couple of the next following commands in terminal would not work without changing the path in command, so it is recommended if you save it on your Desktop)


  • Click on save

How to install Computerisms Certificate Authority into your Ubuntu Operation System


  • Click on the Unity Dash located on the top left corner


  • Open a terminal by typing "terminal" in unity dash search or press Alt+Ctrl+t
  • copy the following line to your terminal:
sudo cp Desktop/Computerisms.Root.Certificate.crt /usr/local/share/ca-certificates


  • Enter your root password(same password that you use to login to computer or install programs) and press Enter
  • Type the following commend into your terminal
sudo update-ca-certificates
  • Make sure that in the output of commend said that 1 added(Like the example in the picture)

How To import Certificate Authority into Google Chrome browser

  • Required: Please follow the "How to download Computerisms Certificate Authority" section first and download the Certificate before moving on to the next step.


  • For adding certificate to google chrome, first open the google chrome


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


  • Click on Manage Certificates
  • Go Under Authorities section


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


  • Click on open
  • Set the check all the option and click on OK


  • Note that the last option "Trust this certificate for identifying software makers" is not required and you can check, or leave it as you wish but the other 2 options are necessarily in order to make it work

How To import Certificate Authority into Firefox browser

  • Required: Please follow the "How to download Computerisms Certificate Authority" section first and download the Certificate before moving on to the next step.


  • Open your Fire Fox browser for adding the certificate


  • Click on the Edit on the top menu bar and click on Preferences
  • Navigate to Advance menu on the left bar


  • Select Certificates on the top bar


  • Click on View Certificates
  • Go under Authorities menu on the top bar


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


  • Click on open
  • Set the check all the option and click on OK


  • Note that the last option "Trust this certificate for identifying software makers" is not required and you can check, or leave it as you wish but the other 2 options are necessarily in order to make it work

How To import Certificate Authority into Thunderbird mail client

  • Required: Please follow the "How to download Computerisms Certificate Authority" section first and download the Certificate before moving on to the next step.


  • Click on the Edit on the top menu bar and click on Preferences
  • Navigate to Advance on the top menu


  • Select Certificates on the top bar


  • Click on View Certificates
  • Go under Authorities menu on the top bar


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


  • Click on open
  • Set the check all the option and click on OK


  • Note that the last option "Trust this certificate for identifying software makers" is not required and you can check, or leave it as you wish but the other 2 options are necessarily in order to make it work