install signal / update error

[printemps]

Hi,
I tried to install Signal's desktop version on Lite 3.8 with following commands:

curl -s https://updates.signal.org/desktop/apt/keys.asc | sudo apt-key add -
echo "deb [arch=amd64] https://updates.signal.org/desktop/apt xenial main" | sudo tee -a /etc/apt/sources.list.d/signal-xenial.list
sudo apt update && sudo apt install signal-desktop

Following error occurs:
E:Type 'sudo' is not known on line 2 in source list /etc/apt/sources.list.d/signal-xenial.list
E:The list of sources could not be read.

Same error for Linux Lite updates when it tries to fetch the package cache information lists...

What can I do?
Thanks for help

[DeepThought]

Not sure how you typed this part into terminal but it should be one line

Code:

echo "deb [arch=amd64] https://updates.signal.org/desktop/apt xenial main" | sudo tee -a /etc/apt/sources.list.d/signal-xenial.list

To check the sources list:

Code:

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

The only line in the signal-xenial.list file should be

Code:

deb [arch=amd64] https://updates.signal.org/desktop/apt xenial main

You may need to edit the line, then control-x , y, and enter to save any edits.
Then try:

Code:

sudo apt update && sudo apt install signal-desktop

[printemps]

Thanks a lot.
After editing the sources list and reducing to one line, update and installation worked without problem.

[DeepThought]

Glad to help