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I don't know why I am getting this from some days in the top panel, though it is different every time

enter image description here

got this on apt update

Err:16 http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu focal InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EF4186FE247510BE Reading package lists... Done W: GPG error: http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EF4186FE247510BE E: The repository 'http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu focal InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.

these two methods didn't solve it y-ppa-manager, keyserver

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2 Answers 2

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You have to try removal and adding this PPA back by

sudo add-apt-repository -r ppa:ubuntu-mozilla-daily/ppa
sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa
sudo apt-get update
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  • I removed Mozilla PPA but that notification is still there Nov 21, 2020 at 7:43
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Make sure mozilla repo is not longer active.

sudo rm /var/lib/apt/lists/in.archive.ubuntu.com_ubuntu_dists_focal_InRelease

The errors says something wrong with permissions. Try again

sudo apt update

if this is not working

software-properties-gtk

and choose download from main server.

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