I can confirm that this bug still exists. Linux ops-jhb-infra-06 4.4.0-64-generic #85-Ubuntu SMP Mon Feb 20 11:50:30 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux apt-cacher-ng: Installed: 0.9.1-1ubuntu1 Candidate: 0.9.1-1ubuntu1 Version table: *** 0.9.1-1ubuntu1 500 500 http://za.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages 100 /var/lib/dpkg/status /etc/apt-cacher-ng/acng.conf # Storage directory for downloaded data and related maintenance activity. # CacheDir: /mnt/data/apt-cacher-ng ls -lash /mnt/data/ total 38K 4.0K drwxr-xr-x 7 root root 4.0K Feb 28 17:18 . 4.0K drwxr-xr-x 6 root root 4.0K Feb 24 11:44 .. 4.0K drwxr-sr-x 2 apt-cacher-ng apt-cacher-ng 4.0K Feb 26 18:59 apt-cacher-ng 16K drwx------ 2 root root 16K Feb 23 19:34 lost+found After restarting and even rebooting package cachdir remains at /var/cache/apt-cacher-ng My hack solution until this problem is fixed upstream: mv /var/cache/apt-cacher-ng /home/sean ln -s /mnt/data/apt-cacher-ng /var/cache/apt-cacher-ng mv apt-cacher-ng/* /mnt/data/apt-cacher-ng/ ls -lash /var/cache/apt-cacher-ng 0 lrwxrwxrwx 1 root root 24 Mar 2 09:21 /var/cache/apt-cacher-ng -> /mnt/data/apt-cacher-ng/ ls -lash /mnt/data/apt-cacher-ng/ total 160K 4.0K drwxr-sr-x 13 apt-cacher-ng apt-cacher-ng 4.0K Mar 2 09:18 . 4.0K drwxr-xr-x 7 root root 4.0K Feb 28 17:18 .. 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Mar 2 07:53 192.168.21.17 4.0K drwxr-sr-x 4 apt-cacher-ng apt-cacher-ng 4.0K Mar 1 21:19 archive.canonical.com 4.0K drwxr-sr-x 2 apt-cacher-ng apt-cacher-ng 4.0K Feb 27 08:16 changelogs.ubuntu.com 0 -rw-r--r-- 1 apt-cacher-ng apt-cacher-ng 0 Mar 2 06:25 _expending_damaged 108K -rw-r--r-- 1 apt-cacher-ng apt-cacher-ng 105K Mar 2 06:25 _expending_dat 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 26 20:45 packages.elastic.co 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 28 22:42 pkg.jenkins-ci.org 4.0K drwxr-sr-x 6 apt-cacher-ng apt-cacher-ng 4.0K Feb 28 05:45 ppa.launchpad.net 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 28 06:42 repo.percona.com 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 26 20:45 security.ubuntu.com 4.0K drwxr-sr-x 4 apt-cacher-ng apt-cacher-ng 4.0K Feb 26 20:50 uburep 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 26 20:45 www.ftp.saix.net 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 27 15:33 www.ubnt.com ls -lash /var/cache/apt-cacher-ng/ total 160K 4.0K drwxr-sr-x 13 apt-cacher-ng apt-cacher-ng 4.0K Mar 2 09:18 . 4.0K drwxr-xr-x 7 root root 4.0K Feb 28 17:18 .. 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Mar 2 07:53 192.168.21.17 4.0K drwxr-sr-x 4 apt-cacher-ng apt-cacher-ng 4.0K Mar 1 21:19 archive.canonical.com 4.0K drwxr-sr-x 2 apt-cacher-ng apt-cacher-ng 4.0K Feb 27 08:16 changelogs.ubuntu.com 0 -rw-r--r-- 1 apt-cacher-ng apt-cacher-ng 0 Mar 2 06:25 _expending_damaged 108K -rw-r--r-- 1 apt-cacher-ng apt-cacher-ng 105K Mar 2 06:25 _expending_dat 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 26 20:45 packages.elastic.co 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 28 22:42 pkg.jenkins-ci.org 4.0K drwxr-sr-x 6 apt-cacher-ng apt-cacher-ng 4.0K Feb 28 05:45 ppa.launchpad.net 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 28 06:42 repo.percona.com 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 26 20:45 security.ubuntu.com 4.0K drwxr-sr-x 4 apt-cacher-ng apt-cacher-ng 4.0K Feb 26 20:50 uburep 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 26 20:45 www.ftp.saix.net 4.0K drwxr-sr-x 3 apt-cacher-ng apt-cacher-ng 4.0K Feb 27 15:33 www.ubnt.com