sandbox

Would you consider a system less secure if the filesystem, starting with /, is owned by the same (non-root) user that owns the processes running in that OS? Probably. But, would you consider the system within a namespace sandbox, such as the one employed by flatpak, to be much less secure if...

Is there any maintained applications which provide a layered sandbox filesystem for Linux? Similar to what Sandboxie does in Windows. Here is an example of what I am talking about, not updated in 5 years. In simple English, I am looking for something that would allow me to install packages...