Dear Maintainer,

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  When using Synaptic, the following error pops up:
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)

This is a bothersome problem and probably should be fixed.

Please see: https://askubuntu.com/questions/908800/what-does-this-apt-error-
message-download-is-performed-unsandboxed-as-root#908825

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