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Internet connection is working.

apt-get is working.

Trying to add ppa:cooperjona/lightread but an error has raised:

Cannot add PPA 'ppa:cooperjona/lightread' . Please check that the PPA name or format is correct.

I supposed there is an error in writing or in the PPA.

I tried also the 'ppa:tombeckmann/ppa' but with same error.

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The issue comes from your system, not the PPA, which works fine for me. –  MrVaykadji Mar 5 at 12:01
    
I tried all of this here and still got the same error. –  user2117580 Jun 19 at 20:21

2 Answers 2

I googled the error and find this. So i tried to clone a git as he did there and has the same result.

So to solve this:

sudo apt-get install --reinstall ca-certificates

and things become smooth again :)

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Open Terminal and run command

sudo apt-get install --reinstall ca-certificates

It will work.

If doesn't then run

sudo -E add-apt-repository ppa:ppaname/ppa

instead of

sudo add-apt-repository ppa:ppaname/ppa
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