Can't add ppa on Ubuntu 15.10 [closed]

Question

I just installed the ubuntu 15.10, and was trying to installed some apps. But I can't add any repository-ppa. Every time it says "user or team does not exist. ex.

sudo add-apt-repository ppa:noobslab/nemo
Cannot add PPA: 'ppa:~noobslab/ubuntu/nemo'.
ERROR: '~noobslab' user or team does not exist.

Please, suggest a fix for this problem.

Edit: I am not talking about that specific ppa, every time for any ppa it says the same thing...

sudo apt-add-repository -y ppa:teejee2008/ppa
Cannot add PPA: 'ppa:~teejee2008/ubuntu/ppa'.
ERROR: '~teejee2008' user or team does not exist

or

sudo add-apt-repository ppa:noobslab/themes
Cannot add PPA: 'ppa:~noobslab/ubuntu/themes'.
ERROR: '~noobslab' user or team does not exist.

.

Answer 1

Found the problem for my installation: proxy-server with authentication, see here: https://askubuntu.com/questions/724224/cant-add-ppa-on-ubuntu-15-10

This leads to this missleading error message. But this can also be every error risen during fetching the data. For debugging I altered the file:

/usr/lib/python3/dist-packages/softwareproperties/ppa.py 

And added a print(e) in the catch case of the function def _get_https_content_py3(lp_url)

Which shows the real reason to me.

Answer 2

I had the same problem. Turns out that the date on my system was set incorrectly. This shows if I try to manually wget the ppa:

$ wget https://launchpad.net/~ubilinux/+archive/ubuntu/up
--2016-02-11 17:41:18--  https://launchpad.net/~ubilinux/+archive/ubuntu/up
Resolving launchpad.net (launchpad.net)... 91.189.89.223, 91.189.89.222
Connecting to launchpad.net (launchpad.net)|91.189.89.223|:443... connected.
ERROR: cannot verify launchpad.net's certificate, issued by ‘CN=DigiCert SHA2 Extended Validation Server CA,OU=www.digicert.com,O=DigiCert Inc,C=US’:
  Issued certificate not yet valid.
To connect to launchpad.net insecurely, use `--no-check-certificate'.

The date on my system was one year behind. Correcting the date solves the problem. https://askubuntu.com/questions/679988/how-to-change-ubuntus-server-date-and-time-via-command-line