Unable to download signal-desktop on Ubuntu 20.04 LTS. Please help!

Question

So I tried to install Signal-desktop on Ubuntu 20.04 LTS according to the instructions given on the official website of Signal:-

# NOTE: These instructions only work for 64 bit Debian-based
# Linux distributions such as Ubuntu, Mint etc.

# 1. Install our official public software signing key
wget -O- https://updates.signal.org/desktop/apt/keys.asc | gpg --dearmor > signal-desktop- 
keyring.gpg
sudo mv signal-desktop-keyring.gpg /usr/share/keyrings/

# 2. Add our repository to your list of repositories
echo 'deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.gpg] 
https://updates.signal.org/desktop/apt xenial main' |\
 sudo tee -a /etc/apt/sources.list.d/signal-xenial.list

# 3. Update your package database and install signal
sudo apt update && sudo apt install signal-desktop

When I ran #1, I got,

deep@maharajadhiraja-deep:~$ wget -O- https://updates.signal.org/desktop/apt/keys.asc | gpg 
--dearmor > signal-desktop-keyring.gpg
--2021-04-04 20:50:47--  https://updates.signal.org/desktop/apt/keys.asc
Resolving updates.signal.org (updates.signal.org)... 2606:4700::6812:1f70, 
2606:4700::6812:1e70, 104.18.31.112, ...
Connecting to updates.signal.org (updates.signal.org)|2606:4700::6812:1f70|:443... 
connected.
HTTP request sent, awaiting response... 200 OK
Length: 3090 (3.0K) [application/pgp-signature]
Saving to: ‘STDOUT’

-                   100%[===================>]   3.02K  --.-KB/s    in 0s      

2021-04-04 20:50:48 (27.0 MB/s) - written to stdout [3090/3090]
deep@maharajadhiraja-deep:~$ sudo mv signal-desktop-keyring.gpg /usr/share/keyrings/

#2

deep@maharajadhiraja-deep:~$ echo 'deb [arch=amd64 signed-by=/usr/share/keyrings/signal- 
desktop-keyring.gpg] https://updates.signal.org/desktop/apt xenial main' |  sudo tee -a 
/etc/apt/sources.list.d/signal-xenial.list
deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.gpg] 
https://updates.signal.org/desktop/apt xenial main

#3

deep@maharajadhiraja-deep:~$ sudo apt update && sudo apt install signal-desktop
E: Conflicting values set for option Signed-By regarding source 
https://updates.signal.org/desktop/apt/ xenial: /usr/share/keyrings/signal-desktop- 
keyring.gpg != 
E: The list of sources could not be read.

And so I'm unable to install Signal-desktop. Moreover,

 sudo apt-get <function>

is also not working. For example, when I try to run on the terminal:

 sudo apt-get upgrade

it returns:-

 E: Conflicting values set for option Signed-By regarding source 
 https://updates.signal.org/desktop/apt/ xenial: /usr/share/keyrings/signal-desktop- 
 keyring.gpg != 
 E: The list of sources could not be read.
 E: Conflicting values set for option Signed-By regarding source 
 https://updates.signal.org/desktop/apt/ xenial: /usr/share/keyrings/signal-desktop- 
 keyring.gpg != 
 E: The list of sources could not be read.

I'm clueless as to what is happening out here. Please help me out.

I'm fairly a new user of Ubuntu and I'm trying to figure things out myself. Thank you in advance for attention.

Answer 1

Both problems, installation and running of signal-desktop as well as apt-get functionality returning this error, come from unexpected content in /etc/apt/sources.list.d/signal-xenial.list. (In my case this was introduced when trying to install the beta version of signal-desktop).

I would simply remove the apt file in question:

sudo rm /etc/apt/sources.list.d/signal-xenial.list

After that, re-do the steps listed on https://signal.org/de/download/# for installation of signal and things should work.

Answer 2

Install signal-desktop from the Ubuntu software Center.

It will be a much cleaner install bringing with it all the additional bits it requires.