Installation of certificate in Ubuntu operating system
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The following instructions are valid for all Debian based Linux distributions, (including: Ubuntu, Mint, Raspbian, Kali, elementary OS and more)
Open the command line.
Run the following command:
curl -sL http://netfree.link/dl/ubuntuCertInstallNetFree.sh | sudo -E bash -
Sometimes the command will fail due to the fact that curl isn't installed, and it will give a message: Command 'curl' not found
To fix this, enter the command: sudo apt install curl
Then rerun the previous command.
It is recommended that you restart the computer after this.
P.S. To install the certificate you need root permission
To use Firefox you must install the security certificate separately. You can also install a certificate for Chrome individually.