How to enable proposed archive repo on Ubuntu Linux to install packages

To enable the proposed repository on Ubuntu, follow these steps:

1. Open a terminal and run the following command to edit the sources.list file:

sudo nano /etc/apt/sources.list

2. Add the following line to the end of the file:

deb http://archive.ubuntu.com/ubuntu/ YOUR_UBUNTU_VERSION-proposed restricted main multiverse universe

Replace YOUR_UBUNTU_VERSION with the version of Ubuntu that you are using. For example, if you are using Ubuntu 20.04, you would use focal-proposed.

3. Save the file and exit the editor.

4. Run the following command to update the package list:

sudo apt update

5. You can now install packages from the proposed repository using apt. For example, to install a package called package-name, you would use the following command:

sudo apt install package-name

Keep in mind that packages in the proposed repository are not fully tested and may contain bugs. Use them at your own risk.