I have removed the duplicate status as the linked ticket is now marked as "Fix Released" but with an up-to-date system I'm still able to reproduce the problem (I was also wondering a bit why the other ticket was only posted against aptitude).
** This bug is no longer a duplicate of bug 1537512 Can't drop privileges for downloading as file -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. https://bugs.launchpad.net/bugs/1532944 Title: flashplugin-installer shows an error message after downloading the file with apt 1.1.x Status in apt package in Ubuntu: Confirmed Status in flashplugin-nonfree package in Ubuntu: Confirmed Bug description: I'm using Ubuntu 16.04 dev with apt 1.1.10 and on trying to install flashplugin-installer I'm always getting an error message after the file got downloaded. Here is an example output: root@ubuntu:~# apt-get install flashplugin-installer --reinstall Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: libapt-inst1.7 libapt-pkg4.16 Use 'apt autoremove' to remove them. 0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded. Need to get 0 B/6838 B of archives. After this operation, 0 B of additional disk space will be used. debconf: delaying package configuration, since apt-utils is not installed (Reading database ... 99770 files and directories currently installed.) Preparing to unpack .../flashplugin-installer_11.2.202.559ubuntu1_amd64.deb ... Unpacking flashplugin-installer (11.2.202.559ubuntu1) over (11.2.202.559ubuntu1) ... Processing triggers for update-notifier-common (3.164) ... flashplugin-installer: downloading http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_20151228.1.orig.tar.gz Get:1 http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_20151228.1.orig.tar.gz [26.8 MB] Fetched 26.8 MB in 3min 8s (143 kB/s) W: Can't drop privileges for downloading as file '/var/lib/update-notifier/package-data-downloads/partial/adobe-flashplugin_20151228.1.orig.tar.gz' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied) Installing from local file /var/lib/update-notifier/package-data-downloads/partial/adobe-flashplugin_20151228.1.orig.tar.gz Flash Plugin installed. Setting up flashplugin-installer (11.2.202.559ubuntu1) ... To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1532944/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp