Ubuntu 16.05 Flash 从版本 11.2.202.635 升级到 23.0.0.162

Ubuntu 16.05 Flash Upgrade From Version11.2.202.635 to 23.0.0.162

当我尝试升级到最新版本的 Flash 时收到错误消息

W:The repository 'http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu xenial Release' does not have a Release file., 
W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., 
W:See apt-secure(8) manpage for repository creation and user configuration details., 
E:Failed to fetch http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found, 
E:Some index files failed to download. They have been ignored, or old ones used instead.

我不知道如何解决这个问题。

我正在尝试通过 Adobe Flash Player Download 进行升级。我一直在选择选项 "APT For Ubuntu 10.04+"

我不知道我还需要提供什么其他信息来解决这个问题。请指教

您需要从 /etc/apt/sources.list 或 /etc/apt/sources.list.d/*.list

中找到并删除 pidgin-developers PPA