由于 Ubuntu 21.10 不再支持 python 3.6，通常的deadsnakes方法也不起作用。它给出以下错误。
E: The repository 'http://ppa.launchpad.net/deadsnakes/ppa/ubuntu impish Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.