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.