apt-cache 显示它知道哪些软件包，而不是您已安装的软件包。尝试 apt-cache policy psa 来查看首选哪个，并尝试 dpkg -l psa 来查看实际安装的内容。
apt-cache
apt-cache shows you what packages it knows about, not which packages you have installed. Try apt-cache policy psa to see which one is preferred, and dpkg -l psa to see what is actually installed.
apt-cache policy psa
dpkg -l psa
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apt-cache显示它知道哪些软件包，而不是您已安装的软件包。尝试 apt-cache policy psa 来查看首选哪个，并尝试 dpkg -l psa 来查看实际安装的内容。apt-cacheshows you what packages it knows about, not which packages you have installed. Tryapt-cache policy psato see which one is preferred, anddpkg -l psato see what is actually installed.