If you try to install Jenkins on Ubuntu 18.0.4/20.0.4 instance, you may experience this problem.
Running sudo apt-get update on my AWS EC2 Ubuntu 18.04.01 LTS instance fails because Certificate verification failed: The certificate is NOT trusted.
Err:6 https://pkg.jenkins.io/debian-stable binary/ Release
Fix for the above error
You need to install certificates to overcome this error:
sudo apt install ca-certificates
sudo apt-get update
Now try installing Jenkins
sudo apt install jenkins -y
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