I acted as instructed here:
https://www.sublimetext.com/docs/linux_repositories.html
while, after I input such in Ubuntu 20.04:
echo “deb https://download.sublimetext.com/ apt/dev/” | sudo tee /etc/apt/sources.list.d/sublime-text.list
sudo apt-get update
it was prompted:
E: Malformed entry 1 in list file /etc/apt/sources.list.d/sublime-text.list (Component)
E: The list of sources could not be read.