PPA 似乎一直处于离线状态。每当我使用时sudo apt-get update，都会显示此错误：
W: Failed to fetch http://ppa.launchpad.net/ 404 Not Found
如何修复这些错误？
我正在运行 Ubuntu 服务器（9.0.4 'Jaunty'）作为 VMware 映像。
在我需要安装一个新的软件包以取出安装 CD-ROM 并将其提供给 VMware 映像以便我可以继续安装软件包的特殊情况下，这真的很痛苦。
有什么方法可以将原始安装媒体从源包列表中删除 - 我假设所有包都可以在 Internet 上使用。
谢谢。
我最近在我的电脑上安装了 Ubuntu 16.04，我尝试安装谷歌浏览器，但我无法安装。这是我得到的。
$ sudo dpkg -i ~/Downloads/google_chrome.deb
(Reading database ... 207470 files and directories currently installed.)
Preparing to unpack .../Downloads/google_chrome.deb ...
Unpacking google-chrome-stable (55.0.2883.87-1) over (55.0.2883.87-1) ...
dpkg: dependency problems prevent configuration of google-chrome-stable:
google-chrome-stable depends on libappindicator1; however:
Package libappindicator1 is not installed.
dpkg: error processing package google-chrome-stable (--install):
dependency problems - leaving unconfigured
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for bamfdaemon (0.5.3~bzr0+16.04.20160824-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for gnome-menus (3.13.3-6ubuntu3.1) ...
Processing triggers for desktop-file-utils …$ sudo apt update
E: The repository 'cdrom://Ubuntu 20.04.2.0 LTS _Focal Fossa_ - Release amd64 (20210209.1) focal 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.