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Try to run sudo apt-get install --reinstall ca-certificates
If still does not work, then run: sudo -E add-apt-repository ppa:ppaname/ppa
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solved Cannot add PPA: ‘ppa:~ubuntu-desktop/ubuntu/ubuntu-make’
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Try to run sudo apt-get install --reinstall ca-certificates
If still does not work, then run: sudo -E add-apt-repository ppa:ppaname/ppa
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solved Cannot add PPA: ‘ppa:~ubuntu-desktop/ubuntu/ubuntu-make’