Fix "Cannot add PPA. Please check that the PPA name or format is correct" And Other CA-Certificates Related Issues In Ubuntu

Yesterday I encountered an issue in Ubuntu related to CA-certificates which resulted in errors when trying to add PPA repositories, cloning GIT repositories and more and I decided to make an article on how to fix these issues in Ubuntu, in case you run into the same issue.Here’s what happened. Firstly, I tried adding a PPA via command line, and this was the output:sudo add-apt-repository ppa:webupd8team/java[sudo] password for andrei: Cannot add PPA: ‘ppa:webupd8team/java’.Please check that the PPA name or format is correct.The PPA name was definitely correct and I wasn’t using any proxies so I had no idea what could be wrong at that point. Then I tried to add the PPA via Software Sources (called “Software & Updates” in newer Ubuntu versions). That didn’t work either.Then (it may seem unrelated but it actually wasn’t) I tried to clone a Git (GitHub) repository and the following error was displayed:fatal: unable to access ‘http://github.com/rg3/youtube-dl.git’: server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: noneThanks to this error message I figured out that there was something wrong with CA certificates (the “ca-certificates” package includes PEM files of CA certificates to allow SSL-based applications to check for the authenticity of SSL connections). For

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