This bug was fixed in the package ristretto - 0.8.3-1ubuntu1
--------------- ristretto (0.8.3-1ubuntu1) disco; urgency=medium
* d/patches/lp1756191.patch: - Fix thumbnail generation from upstream (LP: #1756191)
-- Sean Davis <email address hidden> Sun, 07 Apr 2019 16:31:49 -0400
This bug was fixed in the package ristretto - 0.8.3-1ubuntu1
---------------
ristretto (0.8.3-1ubuntu1) disco; urgency=medium
* d/patches/ lp1756191. patch:
- Fix thumbnail generation from upstream (LP: #1756191)
-- Sean Davis <email address hidden> Sun, 07 Apr 2019 16:31:49 -0400