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.