[Pkg-virtualbox-devel] Bug#860744: upgrade stuck at displaying license

[Erwan David]

Package: virtualbox-ext-pack
Version: 5.1.20-1
Severity: grave

When trying to upgrade the package, the license if displayed, then
nothing, no way to accept or refuse it.
Must kill several processes and end up with a non working package.

-- System Information:
Debian Release: 8.7
  APT prefers proposed-updates
  APT policy: (1001, 'proposed-updates'), (1001, 'stable'), (600, 'testing'), (500, 'stable-updates'), (400, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-0.bpo.2-amd64 (SMP w/8 CPU cores)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages virtualbox-ext-pack depends on:
ii  debconf [debconf-2.0]        1.5.57
ii  virtualbox-5.1 [virtualbox]  5.1.20-114628~Debian~jessie
ii  wget                         1.16-1+deb8u2

virtualbox-ext-pack recommends no packages.

virtualbox-ext-pack suggests no packages.

-- debconf information:
* virtualbox-ext-pack/license: true