*** This bug is a duplicate of bug 1522675 ***
https://bugs.launchpad.net/bugs/1522675
Check to see if you have an _apt user:
cat /etc/passwd | grep apt
_apt:x:105:65534::/nonexistent:/bin/false
If you do, no need to add the user. Otherwise,
adduser --force-badname --system --home /nonexistent --no-create-home
--quiet _apt || true
I haven't verified that it creates precisely the user necessary. If I
remember correctly, /bin/false means no shell access so make sure the
user created does in fact have /bin/false in passwd. Also it has no
group (65534). That is it really.
Finally check the directory situation:
ls -la /var/lib/update-notifier/package-data-downloads/
drwxr-xr-x 2 _apt root 4096 Nov 9 10:23 partial
As you can see "_apt" is properly listed as the owner. If not,
sudo chown _apt /var/lib/update-notifier/package-data-downloads/partial/
My system already had an _apt user, but did not have proper directory
permissions. At least, I have to assume that this is a proper fix. If
not, somebody more knowledgeable should be speaking up and sorting this
out...
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https://bugs.launchpad.net/bugs/1543280
Title:
Synaptic fails with "W: Can't drop privileges for downloading as file
'/root/.synaptic/tmp//tmp_sh' couldn't be accessed by user '_apt'. -
pkgAcquire::Run (13: Permission denied)"
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