1. Enable 32 bit architecture

For modern 64-bit systems, you may first make sure the ability to install 32-bit app packages has been enabled.

To do so, press Ctrl+Alt+T on keyboard to open terminal. When it opens, run command:

sudo dpkg --add-architecture i386

2. Install the key:

To make your system trust the package from Wine repository, you have to download & install the key.

It’s can be done simply by running the command below in terminal:

wget -O - https://dl.winehq.org/wine-builds/winehq.key | sudo apt-key add -

Though the apt-key command is deprecated, it’s still working and the most efficient so far.

3. Add Wine Repository:

Now in terminal window, run command to add the Wine repository:

sudo add-apt-repository 'deb https://dl.winehq.org/wine-builds/ubuntu/ focal main'

4. Install Wine 7.0:

Finally, refresh system package cache by running command:

sudo apt update

And, install Wine 7.0 via:

sudo apt install --install-recommends winehq-stable