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 re-run the previous command.

It is recommended that you restart the computer after this.

In order 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.

If you are currently not connected to NetFree, the certificate should be downloaded from the links on this page.

Then run the following commands:

First, you must create the folder where the files are stored and for that you should run the following command:

sudo mkdir /usr/share/ca-certificates/extra

Now copy the security certificate to the folder we created.

For example:

For ISP 019, a file named 019.crt is downloaded.

We now have to install this certificate, this is done by opening the console in the download folder and running the following command:

sudo cp 019.crt /usr/share/ca-certificates/extra/019.crt

Of course the name in the command should be renamed to the downloaded file name.