This bug was fixed in the package livecd-rootfs - 2.408.49
--------------- livecd-rootfs (2.408.49) xenial; urgency=medium
* Add explicit dependency on python3-yaml, which is used in the code but was previously pulled in indirectly via ubuntu-image. LP: #1830823.
-- Steve Langasek <email address hidden> Thu, 30 May 2019 14:20:30 -0700
This bug was fixed in the package livecd-rootfs - 2.408.49
---------------
livecd-rootfs (2.408.49) xenial; urgency=medium
* Add explicit dependency on python3-yaml, which is used in the code but
was previously pulled in indirectly via ubuntu-image. LP: #1830823.
-- Steve Langasek <email address hidden> Thu, 30 May 2019 14:20:30 -0700