This appears to be a failure in the plymouth hooks:
sed: can't read /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth: No such file or directory
E: /usr/share/initramfs-tools/hooks/plymouth failed with return 2.
update-initramfs: failed for /boot/initrd.img-4.4.0-2-generic with 2.
This appears to be a failure in the plymouth hooks:
sed: can't read /usr/share/ plymouth/ themes/ ubuntu- text/ubuntu- text.plymouth: No such file or directory initramfs- tools/hooks/ plymouth failed with return 2. initramfs: failed for /boot/initrd. img-4.4. 0-2-generic with 2.
E: /usr/share/
update-