Let's downgrade to back out of deep water...
dpkg: warning: downgrading imagemagick-6.q16 from 8:6.9.2.10+dfsg-2 to
8:6.8.9.9-7+b1
Preparing to unpack .../imagemagick-6.q16_8%3a6.8.9.9-7+b1_i386.deb ...
Unpacking imagemagick-6.q16 (8:6.8.9.9-7+b1) over (8:6.9.2.10+dfsg-2) ...
Processing triggers for mime-support (3.59) ...
Processing triggers for menu (2.1.47) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for desktop-file-utils (0.22-1) ...
Processing triggers for hicolor-icon-theme (0.13-1) ...
Setting up imagemagick-6.q16 (8:6.8.9.9-7+b1) ...
Setting up imagemagick (8:6.8.9.9-7+b1) ...
update-alternatives: warning: alternative /usr/bin/compare-im6.q16 (part of
link group compare) doesn't exist; removing from list of alternatives
update-alternatives: warning: /etc/alternatives/compare is dangling; it will be
updated with best choice
update-alternatives: using /usr/bin/compare-im6 to provide /usr/bin/compare
(compare) in auto mode
update-alternatives: warning: alternative /usr/bin/animate-im6.q16 (part of
link group animate) doesn't exist; removing from list of alternatives
update-alternatives: warning: /etc/alternatives/animate is dangling; it will be
updated with best choice
update-alternatives: using /usr/bin/animate-im6 to provide /usr/bin/animate
(animate) in auto mode
update-alternatives: warning: alternative /usr/bin/convert-im6.q16 (part of
link group convert) doesn't exist; removing from list of alternatives
update-alternatives: warning: /etc/alternatives/convert is dangling; it will be
updated with best choice
update-alternatives: using /usr/bin/convert-im6 to provide /usr/bin/convert
(convert) in auto mode
update-alternatives: warning: alternative /usr/bin/composite-im6.q16 (part of
link group composite) doesn't exist; removing from list of alternatives
update-alternatives: warning: /etc/alternatives/composite is dangling; it will
be updated with best choice
update-alternatives: using /usr/bin/composite-im6 to provide /usr/bin/composite
(composite) in auto mode
update-alternatives: warning: alternative /usr/bin/conjure-im6.q16 (part of
link group conjure) doesn't exist; removing from list of alternatives
update-alternatives: warning: /etc/alternatives/conjure is dangling; it will be
updated with best choice
...
