I don't know why but after a while I can't add any working ppa any more! When I try this:

sudo add-apt-repository ppa:webupd8team/tor-browser

the output is:

Cannot add PPA: 'ppa:webupd8team/tor-browser'.
Please check that the PPA name or format is correct.

I have ubuntu 13.10 64bit.

  • Are you behind a proxy? – jobin Dec 21 '13 at 9:04
  • really I don't know . Sometimes Ago I install tor-browser and mabye it made the problem . – mahdiar Dec 21 '13 at 9:08
  • Can you do a sudo apt-get update? If yes, what are the contents of your /etc/apt/apt.conf file? – jobin Dec 21 '13 at 9:29
  • yes I can . I don't have such file . I have auth.conf . Is it what you are looking for ? – mahdiar Dec 21 '13 at 13:40
  • cross-site duplicate: Unable to add PPA repository from terminal – phuclv Jun 6 '18 at 3:28

Try `sudo apt-get install --reinstall ca-certificates

More info at `http://www.webupd8.org/2014/03/fix-cannot-add-ppa-please-check-that.html

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