我最近刚刚在戴尔 Vostro 15笔记本电脑上升级到Ubuntu 18.04 。我遇到了一些与pulseaudio相关的问题，所以我运行了这些命令，如下所示
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？
远射
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