Errors on Linux command Line for a Simple "Sudo apt Update"

[zenith_lal]

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/repositories/home:/manuelschneid3r/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
]
Get: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
Err:16 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu focal 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 t
he 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
E: The repository 'https://updates.signal.org/desktop/apt xenial 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://repo.protonvpn.com/debian unstable InRelease: The following signatures couldn't be verified because the
 public key is not available: NO_PUBKEY 71EB474019940E11
E: The repository 'https://repo.protonvpn.com/debian unstable 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://repo.windscribe.com/ubuntu bionic InRelease: The following signatures couldn't be verified because the
public key is not available: NO_PUBKEY D5AD3767530B91D0
E: The repository 'https://repo.windscribe.com/ubuntu bionic 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.
E: The repository 'http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu focal Release' does not have a Release file.
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.


I got these errors for a simple sudo apt update. I was actually looking to install Signal Linux App, but It couldn't find the package, So i expected apt update to fix that issue

[Eigenvektor]

Your Linux installation doesn't trust the binaries downloaded from that repository, see the error message:

E: The repository 'https://updates.signal.org/desktop/apt xenial InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

 

This means in order to download/install from that repository you first have to import their public key to say "Yes, I trust this source". Obviously you should only do this for sources you actually trust, because unofficial repositories are a potential source of malware.

[Sauron]

As the error message repeatedly tries to tell you you're missing a few public keys for some of the repositories in your list. Here's how you add them:

sudo apt-key adv --keyserver ha.pool.sks-keyservers.net --recv-keys D5AD3767530B91D0 78BD65473CB3BD13 D980A17457F6FB06 71EB474019940E11

 

[Alexeygridnev1993]

If you don't want to bother with this, you can install and update Signal via snap instead of apt: snap install signal 

[TorC]

debian unstable

bionic beaver

Suse

focal fossa

Xenial

 

all in repo list!

 

What distro -- ubuntu (what?) -- is being used?

Comment out all but what you are running and then

apt update

again.  Any errors?  Post 'em here.

If this were a Slackware forum, someone would probably say things much more unkind.

[mys31fosu]

Why do I see so so so many repos for different versions of Ubuntu here... for god's sake, please please reinstall EVERYTHING.

Or at least please attempt to use this script: https://github.com/davidfoerster/aptsources-cleanup

[gardotd426]

Dude you have JACKED up your installation.

 

Don't add repos from other distros, that's the dumbest shit ever.