我正在运行 Ubuntu Bionic Beaver。我试图在 Ubuntu 上下载万神殿桌面环境，但没有成功，所以我放弃了。现在，当我尝试从终端下载主题或其他东西时，我会收到一个错误代码，其中提到 Elementary OS，尽管我正在下载的内容与 Elementary 或万神殿无关。以下是终端显示的内容：
jacob@jacob-MacBookPro:~$ sudo apt-add-repository ppa:tista/adapta -y
…
E: The repository 'http://ppa.launchpad.net/elementary-os/testing/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://ppa.launchpad.net/mpstark/elementary-tweaks-daily/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
答案1
根据 PPA 页面 (elementary-os/测试和mpstark/elementary-tweaks-daily) - 他们没有发布适用于 18.04 LTS (Bionic Beaver) 的软件包。
因此，您应该从系统中删除这些 PPA 及其安装的软件包：
sudo apt-get install ppa-purge
sudo ppa-purge ppa:elementary-os/testing
sudo ppa-purge ppa:mpstark/elementary-tweaks-daily