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.

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

Then run the following commands

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

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

Now copy the security certificate to the folder we created

Explaintion with the following example

When selecting 019, a file named 019.crt is downloaded

And now we have to install and 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 command should be renamed as the downloaded file name