[Pkg-virtualbox-devel] Bug#878925: Installation hangs on license

[Andrey Rahmatullin]

Package: virtualbox-ext-pack
Version: 5.1.30-1
Severity: serious

I'm updating virtualbox-ext-pack from 5.1.28-1 to 5.1.30-1 during a dist-
upgrade.

virtualbox-ext-pack: downloading:
http://download.virtualbox.org/virtualbox/5.1.30/Oracle_VM_VirtualBox_Extension_Pack-5.1.30.vbox-
extpack
The file will be downloaded into /usr/share/virtualbox-ext-pack
VirtualBox Extension Pack Personal Use and Evaluation License (PUEL)

License version 10, 20 July 2017

PLEASE READ THE FOLLOWING ORACLE VM VIRTUALBOX EXTENSION PACK PERSONAL
USE AND EVALUATION LICENSE [...]

This seems to hang here.
There is a process spawned by apt which hangs on unfinished read(2):

/usr/lib/virtualbox/VBoxManage extpack install --replace --accept-
license=715c7246dc0f779ceab39446812362b2f9bf64a55ed5d3a905f053cfab36da9e
Oracle_VM_VirtualBox_Extension_Pack-5.1.30.vbox-extpack



-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'unstable'), (500, 'testing'), (101, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.13.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8), LANGUAGE= (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages virtualbox-ext-pack depends on:
ii  debconf [debconf-2.0]  1.5.64
iu  virtualbox             5.1.30-dfsg-1
ii  wget                   1.19.1-4

virtualbox-ext-pack recommends no packages.

virtualbox-ext-pack suggests no packages.

-- debconf-show failed