как мне установить более старую версию Audacity?

The safest way to install an older version of Audacity is to download its .deb file from Ubuntu Packages Search or from an official Ubuntu Launchpad website. You can select the version of Audacity from a list of Audacity versions at Audacity in Launchpad.

Don't try to immediately install this .deb file! Before you install the .deb file that you downloaded simulate the installation in order to check if there are any unmet dependencies with the following command.

apt install --simulate ./package-name.deb # This command does not require sudo.

where package-name.deb should be replaced by the name of a .deb file located in the current directory that you are trying to install.

If the command shows additional unmet dependencies then refer to this answer for information about how to manually download and install them. If the above command is successful then run the following command to install the older version Audacity .deb file that you downloaded.

sudo apt install ./package-name.deb

Разверните версии Ubuntu и найдите нужную версию Audacity, перейдите по ссылке на файл .deb.

https://pkgs.org/download/audacity

Вы можете оказаться в аду зависимостей и не сможете легко установить более старые версии.