Package: dpkg
Version: 1.18.18
Severity: grave
Justification: renders package unusable

When I tried to upgrade from aptitude:

Performing actions...
Retrieving bug reports... Done
Parsing Found/Fixed information... Done
Retrieving bug reports... Done
Parsing Found/Fixed information... Done
Reading changelogs... Done
apt-listchanges: Do you want to continue? [Y/n] 
(Reading database ... 509222 files and directories currently installed.)
Preparing to unpack .../libapt-pkg5.0_1.4~beta3_amd64.deb ...
Unpacking libapt-pkg5.0:amd64 (1.4~beta3) over (1.4~beta2) ...
Setting up libapt-pkg5.0:amd64 (1.4~beta3) ...
dpkg: error: dpkg status database is locked by another process
======  How can you help?  (doc: https://wiki.debian.org/how-can-i-help ) ======

-----  Show old opportunities as well as new ones: how-can-i-help --old  -----
E: Sub-process /usr/bin/dpkg returned an error code (2)
Processing triggers for libc-bin (2.24-8) ...
Press Return to continue, 'q' followed by Return to quit.

The only other process matching apt and dpkg is aptitude itself.

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 
'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.8.0-2-amd64 (SMP w/12 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages dpkg depends on:
ii  libbz2-1.0   1.0.6-8
ii  libc6        2.24-8
ii  liblzma5     5.2.2-1.2
ii  libselinux1  2.6-3
ii  tar          1.29b-1.1
ii  zlib1g       1:1.2.8.dfsg-4

dpkg recommends no packages.

Versions of packages dpkg suggests:
ii  apt  1.4~beta2

-- no debconf information

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