当我试图将apache guacamole的ppa添加到我的ubuntu服务器时，我得到了这个错误。此处......看起来找到了InRelease存档，但我在Release存档上得到一个错误。 有什么方法可以解决这个问题吗？ 我可以使用 InRelease 存档而不使用 Release 存档吗？ 显然通过 apt-install 安装更容易，但如果我必须用另一种方式来安装，我也不反对。
$ sudo add-apt-repository ppa:guacamole/stable
The most recent stable release of Guacamole and its components. The packages here use the same packaging as the downstream Debian and Ubuntu packages, but are updated more frequently, usually while the corresponding downstream packages are under official review.
More info: https://launchpad.net/~guacamole/+archive/ubuntu/stable
Press [ENTER] to continue or Ctrl-c to cancel adding it.
Hit:1 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease
Ign:4 http://ppa.launchpad.net/guacamole/stable/ubuntu bionic InRelease
Hit:5 http://us.archive.ubuntu.com/ubuntu bionic-security InRelease
Err:6 http://ppa.launchpad.net/guacamole/stable/ubuntu bionic Release
404 Not Found [IP: 91.189.95.83 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/guacamole/stable/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.
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic
这个ppa已经不再维护了。那里最新的包是2013年的:所以，你需要使用教程从源头安装它。