[Wapt] need help for isntalaltion

Hey everybody,

I'm a begginner in linux and I try to install install wapt on a Debian 9

Fist I've install Debian and it looks ok

Then I try to install wapt .

I use

https://www.wapt.fr/fr/doc/Installation/waptserver/linux/debian/index.html#

I'm logged with user account

I change for root

su -l

looks OK

I try the first line

apt-get update && apt-get upgrade

looks OK

I try

wget -O - http://wapt.tranquil.it/debian/tiswapt-pub.gpg | apt-key add -

Doesn't work properly

I try

echo "deb http://wapt.tranquil.it/debian/wapt-1.3/ $(lsb_release -c -s) main" > /etc/apt/sources.list.d/wapt.list

looks Ok

I try

apt-get update

looks bad ..

Is there anybody to help me please ?

Sincerely

Luc VINCENT