I only had that whily trying to install ttf-mscorefonts-installer The problem appeared after upgrading from 15.10 gnome-ubuntu flavour to its 16.04 LTS version (amd64)
I solved the problem by downloading (manually) the 3.6 version of ttf-mscorefonts-installer from debian (https://packages.debian.org/de/sid/all/ttf-mscorefonts-installer/download). installing that package with gnome's software center (and probably also ubuntu's software center) works perfectly. Probably this is a workaround and not a solution -- 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: Can't drop privileges for downloading : _apt user not allowed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1522675/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs