I was able to workaround this problem by following Mauricio Grueso's suggestion in bug #1776652: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1776652
I was able to workaround this problem by following Mauricio Grueso's suggestion in bug #1776652: /bugs.launchpad .net/ubuntu/ +source/ initramfs- tools/+ bug/1776652
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