Slightly off-topic, but Ubuntu has been displaying “Permission denied” errors implicating the “_apt” user for quite some time now whenever it updates its “adobe-flashplugin” package:gurfle wrote:Access with apt is now possible after doing:
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W: Can't drop privileges for downloading as file '/var/lib/update-notifier/packa
ge-data-downloads/partial/adobe-flashplugin_20170616.1.orig.tar.gz' couldn't be
accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)
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# setfacl -m _apt:rwx /var/lib/update-notifier/package-data-downloads/partial
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$ getfacl -t /var/lib/update-notifier/package-data-downloads/partial
getfacl: Removing leading '/' from absolute path names
# file: var/lib/update-notifier/package-data-downloads/partial/
USER root rwx
user _apt rwx
GROUP root r-x
mask rwx
other r-x