Install Error on XRDP install

Can anyone explain what went wrong during the install of XRDP. Not real sure about the “sandboxed” thing. Thanks for your help, New to Lubuntu.

W: Download is performed unsandboxed as root as file ‘/root/.synaptic/tmp//tmp_sh’ couldn’t be accessed by user ‘_apt’. - pkgAcquire::Run (13: Permission denied)

How did you try to install this?

It works, I just wanted to know what the “sandbox “ error was. What is “sandbox “?

To be fair, I’ve never seen the error ever, so I’m not sure what to tell you. This is why I was asking you the steps you took so I could try to replicate.