This bug was fixed in the package imagemagick - 8:6.9.7.4+dfsg-16ubuntu6
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imagemagick (8:6.9.7.4+dfsg-16ubuntu6) bionic; urgency=medium
* Stop installing the Debian-specific .desktop for the display program.
(LP: #1740741, LP: #1740743, LP: #1717951, LP: #1615435,
** Package changed: ubuntu-settings (Ubuntu) => imagemagick (Ubuntu)
** Changed in: imagemagick (Ubuntu)
Status: Confirmed => Fix Committed
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubuntu-settings (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1740741