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Ubuntu 20.04
The following steps were based on this article. But if you just followed that article blindly, you may not realize if MAY not work.
The steps below include additional checks at the critical step to ensure we can enable the sublime repository
## refresh your repositories
sudo apt update
## install dependencies necessary to add a new repository
sudo apt install dirmngr gnupg apt-transport-https ca-certificates software-properties-common
## download the GPG keys for the new repository to be added
## the following step is key, you may not realise it does not work
curl -fsSL https://download.sublimetext.com/sublimehq-pub.gpg | sudo apt-key add -
## The default Ubuntu install DOES NOT INSTALL curl by default
## So a better way is to confirm curl is present before running the above
sudo which curl
## if the path to curl binary is not shown, then install curl first
sudo apt install curl -y
## then go back and repeat
curl -fsSL https://download.sublimetext.com/sublimehq-pub.gpg | sudo apt-key add -
## followed by adding the repository
sudo add-apt-repository "deb https://download.sublimetext.com/ apt/stable/"
## confirm that the sublime repository was added to the apt repository sources
grep ^deb.*sublime /etc/apt/sources.list
## you should get the following output (this is an output, don't execute this)
deb https://download.sublimetext.com/ apt/stable/
## if all above checks have passed, then install sublime
sudo apt install sublime-text
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