I Can't remove Signal-Desktop (https://signal.org/) in Ubuntu 20.x

The app was originally installed by using Signal official website installation instructions:

Linux (Debian-based) Install Instructions

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
   
    cat signal-desktop-keyring.gpg | sudo tee -a /usr/share/keyrings/signal-desktop-keyring.gpg > /dev/null
   
   

   
   



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
   
   

   
   

ISSUE

To remove the signal-desktop I use any of the following:

$ sudo apt-get purge signal-desktop

$ sudo apt remove signal-desktop

$ sudo apt remove signal-desktop

Every time the removal is attempted it gives the following message:

E: Malformed line 3 in source list /etc/apt/sources.list.d/signal-xenial.list (type)

E: The list of sources could not be read.

E: Malformed line 3 in source list /etc/apt/sources.list.d/signal-xenial.list (type)

E: The list of sources could not be read.

Using sudoedit /etc/apt/sources.list.d/signal-xenial.list

I can open the file that shows

deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.gpg] https://updates.signal.org/desktop/apt>

$ sudo apt-get update also doesn't work as I get the message

E: Malformed line 3 in source list /etc/apt/sources.list.d/signal-xenial.list (type)

E: The list of sources could not be read.

I am not sure how to remove Signal.