I'm also seeing the "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)" error. This is actually a fairly new thing, within the last few weeks. I'm on Linux Mint 19.2 (based on Ubuntu 18.04). Is there a fix yet?
I'm also seeing the "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)" error. This is actually a fairly new thing, within the last few weeks. I'm on Linux Mint 19.2 (based on Ubuntu 18.04). Is there a fix yet?