Package icedtea-8-plugin is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'icedtea-8-plugin' has no installation candidate
答案1
为了确保软件包“icedtea-8-plugin”有一个安装候选，确保您的Software & Updates应用程序设置如下。multiverse存储库应被选中。当您关闭窗口时，它会要求您重新加载软件数据库的权限...请继续并批准。
然后，在 中terminal执行以下操作来安装缺少的软件：
注意：这sudo apt-get update是多余的，但最好确保它已完成。
sudo apt-get updatesudo apt-get install icedtea-8-plugin
