Comment 76 for bug 1522675

Fresh install of 16.04.2, with latest updates.

# apt-get install wine

ttf-mscorefonts-installer: processing...
ttf-mscorefonts-installer: downloading http://downloads.sourceforge.net/corefonts/andale32.exe
Get:1 http://downloads.sourceforge.net/corefonts/andale32.exe [198 kB]
Fetched 198 kB in 11s (16.8 kB/s)
W: Can't drop privileges for downloading as file '/var/lib/update-notifier/package-data-downloads/partial/andale32.exe' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)
...
Similar messages for 10 more .exe files.

Result is the user has no idea whether Wine has been fully installed correctly or not.

/etc/passwd includes the line
_apt:x:105:65534::/nonexistent:/bin/false

# ll /var/lib/update-notifier/package-data-downloads/partial/
total 8
drwxr-xr-x 2 root root 4096 Jun 26 14:41 ./
drwxr-xr-x 3 root root 4096 Jun 26 14:41 ../