Typo in command line when trying to update packages with sudo apt. Ensure spelling is correct and use proper syntax.
Typo in command line when trying to update packages with sudo apt. Ensure spelling is correct and use proper syntax.
zenithlal@zenithlal-Satellite-C850-B907:~$ sudo apt update Ign:1 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu focal InReleas e Hit:2 https://brave-browser-apt-beta.s3.brave.com stable InRelease Hit:3 https://repo.steampowered.com/steam stable InRelease Get:4 http://dl.google.com/linux/chrome/deb stable InRelease [1,811 B] Hit:5 http://in.archive.ubuntu.com/ubuntu focal InRelease Hit:6 http://download.opensuse.org/repositorie...chneid3r/x Ubuntu_20.04 InRelease Hit:7 http://in.archive.ubuntu.com/ubuntu focal-updates InRelease Hit:8 http://security.ubuntu.com/ubuntu focal-security InRelease Err:4 http://dl.google.com/linux/chrome/deb stable InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13 Hit:9 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu focal InRel ease Hit:10 http://in.archive.ubuntu.com/ubuntu focal-backports InRelease Get:11 https://updates.signal.org/desktop/apt xenial InRelease [2,316 B ] Hit:12 https://repo.protonvpn.com/debian unstable InRelease [2,521 B] Hit:13 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu focal InRel ease Get:14 https://repo.windscribe.com/ubuntu bionic InRelease [7,322 B] Err:11 https://updates.signal.org/desktop/apt xenial InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D980A17457F6FB06 Err:12 https://repo.protonvpn.com/debian unstable InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 71EB474019940E11 Hit:15 http://ppa.launchpad.net/obsproject/obs-studio/ubuntu focal InRe lease Err:14 https://repo.windscribe.com/ubuntu bionic InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D5AD3767530B91D0 Release 404 Not Found [IP: 2001:67c:1560:8008::19 80] Reading package lists... Done W: GPG error: http://dl.google.com/linux/chrome/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13 E: The repository 'http://dl.google.com/linux/chrome/deb stable 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. W: GPG error: https://updates.signal.org/desktop/apt xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D980A17457F6FB06
Your Linux setup doesn't verify the binaries from that site, notice the warning: E: The repository 'https://updates.signal.org/desktop/apt xenial InRelease' lacks a signature. No: Updating via such a channel isn't allowed by default since it can't be secured properly. This means you must first add their public key to confirm trust—only do this for reputable sources, as unofficial ones may carry malware risks.
The notification keeps suggesting you lack certain public keys for some repositories. To resolve this, add the keys using the command: sudo apt-key adv --keyserver ha.pool.sks-keyservers.net --recv-keys D5AD3767530B91D0 78BD65473CB3BD13 D980A17457F6FB06 71EB474019940E11
To avoid this, you can set up Signal using snap instead of apt: snap install signal
Debian Unstable Bionic Beaver, Suse Focal, Xenial All in Repo List! Which distribution—Ubuntu or something else—is currently active? Please uncomment the relevant line and run apt update again. Report any issues. If this were a Slackware forum, people would likely respond with harsher comments.