Norbert, it is *extremely* inappropriate to edit the bug description to publicize your workaround. Adding instructions to set the sandbox user to "root" at the start of the bug description is quite simply awful.
I have reverted that change. ** Description changed: READ ME FIRST ============= This is a cosmetic issue. The warning message is just that— a warning. Though the message comes up, there is no problem with the install/upgrade happening like normal. That said, feel free to ignore it. It will get fixed, but it's nowhere near as urgent as bugs that actually result in the wrong behavior rather than just a simple extra message. - - - Temporary fix for this annoying bug by Norbert - ============================================== - The commands below are shared without any warranty. - Use it on your own risk. - - cat <<EOF | sudo tee /etc/apt/apt.conf.d/99z-anti-drop - APT::Sandbox::User "root"; - - EOF - - See explanation in - https://bugs.launchpad.net/ubuntu/+source/synaptic/+bug/1522675/comments/85 - . --- Recently we got new versions for synaptic 0.82+build1 & apt 1.1.3, but now get that error when installing/upgrading some packages: Setting up libc6-dbg:amd64 (2.21-0ubuntu5) ... Processing triggers for libc-bin (2.21-0ubuntu5) ... W: Can't drop privileges for downloading as file '/root/.synaptic/tmp//tmp_cl' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied) From nautilus, i'm seeing a /root/ folder locked (x on its icon) and the folder is empty (no /.synaptic/ sub-folder or file), so the above error. oem@u64:~$ ls -l .synaptic total 4 -rw-rw-r-- 1 oem oem 0 Aug 25 11:19 options -rw-rw-r-- 1 oem oem 236 Aug 25 11:19 synaptic.conf oem@u64:~$ ls -l /var/lib/apt/lists/ .... -rw-r----- 1 root root 0 Sep 20 06:36 lock drwx------ 2 _apt root 16384 Sep 24 15:25 partial ...... oem@u64:~$ sudo ls -l /var/lib/update-notifier/package-data-downloads/ ..... drwxr-xr-x 2 _apt root 4096 Sep 22 23:33 partial ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: synaptic 0.82+build1 ProcVersionSignature: Ubuntu 4.3.0-1.10-generic 4.3.0 Uname: Linux 4.3.0-1-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.19.2-0ubuntu8 Architecture: amd64 CurrentDesktop: GNOME Date: Fri Dec 4 05:23:25 2015 SourcePackage: synaptic UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1522675 Title: Warning messages about unsandboxed downloads To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1522675/+subscriptions -- ubuntu-bugs mailing list email@example.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs