I'm getting this error on Ubuntu 17.10:
W: Download is performed unsandboxed as root as file 
'/root/.synaptic/tmp//tmp_cl' couldn't be accessed by user '_apt'. - 
pkgAcquire::Run (13: Permission denied)

I have a user _apt, and it owns /var/lib/update-notifier/package-data-
downloads/partial/

It looks like the problems are 2-fold:
1. The double-slash in '/root/.synaptic/tmp//tmp_cl' is equivalent to /tmp_cl, 
isn't it? That doesn't exist, and probably shouldn't. The double-slash should 
probably be a single slash.
2. Why is _apt supposed to be able to access anything in /root? If 
/root/.synaptic/tmp is a special case, then somebody or some program needs to 
change its ownership. Right now it's:
drwx------ 2 root root /root/.synaptic/tmp

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https://bugs.launchpad.net/bugs/1522675

Title:
  Warning messages about unsandboxed downloads

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