我最近刚刚在Dell Vostro 15笔记本电脑上升级到Ubuntu 18.04。我不得不涉及到的PulseAudio一些问题，所以我跑这些命令如图所示它在这里
sudo apt-get purge pulseaudio
sudo apt-get clean && sudo apt-get autoremove
执行这些命令后，我运行sudo apt-get install pulseaudio甚至尝试运行，sudo apt install pulseaudio但发生了这些错误：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package pulseaudio 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 'pulseaudio' has no installation candidate
任何想法如何解决这个问题？
长镜头
software-properties-gtk
转到选项卡更新并激活仿生更新和仿生安全。
sudo apt update && sudo apt install pulseaudio
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