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I tried following [this][1] guide to install ROS, but even after adding ROS source.list and its key

sudo apt install ros-melodic-desktop-full

gave error.

E: Unable to locate package ros-melodic-desktop-full

For this, see #q350668, and refer to the linked #q350055 as well.

Then I ran this command

sudo apt search ros

to see if any such package exists. I couldn't find ros-melodic-desktop-full but I found another similar package ros-desktop-full. So I installed it instead. The installation went smooth without giving any errors.

This will not get you ROS Melodic, nor any other specific ROS version.

Refer to wiki/UpstreamPackages for information on what you installed with that command.

I tried following [this][1] guide to install ROS, but even after adding ROS source.list and its key

sudo apt install ros-melodic-desktop-full

gave error.

E: Unable to locate package ros-melodic-desktop-full

For this, see #q350668, and refer to the linked #q350055 as well.

Summarising: ROS Melodic is not supported on Ubuntu 20.04.

Then I ran this command

sudo apt search ros

to see if any such package exists. I couldn't find ros-melodic-desktop-full but I found another similar package ros-desktop-full. So I installed it instead. The installation went smooth without giving any errors.

This will not get you ROS Melodic, nor any other specific ROS version.

Refer to wiki/UpstreamPackages for information on what you installed with that command.

I tried following [this][1] guide to install ROS, but even after adding ROS source.list and its key

sudo apt install ros-melodic-desktop-full

gave error.

E: Unable to locate package ros-melodic-desktop-full

For this, see #q350668, (which is a duplicate of your initial question), and refer to the linked #q350055 as well.

Summarising: ROS Melodic is not supported on Ubuntu 20.04.

Then I ran this command

sudo apt search ros

to see if any such package exists. I couldn't find ros-melodic-desktop-full but I found another similar package ros-desktop-full. So I installed it instead. The installation went smooth without giving any errors.

This will not get you ROS Melodic, nor any other specific ROS version.

Refer to wiki/UpstreamPackages for information on what you installed with that command.