我正在尝试在笔记本电脑上安装最新版本的 Flash Player，我运行的是 ubuntu 14.04.5（通过闪存驱动器，不使用双启动）。我读过有关此主题的其他问题，但一直收到此错误。
ubuntu@ubuntu:~$ sudo apt-get install adobe-flashplugin
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package adobe-flashplugin 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 'adobe-flashplugin' has no installation candidate