Failed 15.10 -> 16.04 upgrade

When doing a 15.10 -> 16.04 I ran into the following bug:
"""
[..]
Setting up linux-image-4.4.0-6-generic (4.4.0-6.21) ...^M
Running depmod.^M
update-initramfs: deferring update (hook will be called later)^M
Examining /etc/kernel/postinst.d.^M
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-6-generic /boot/vmlinuz-4.4.0-6-generic^M
N: Ignoring file '50unattended-upgrades.ucf-dist' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension^M
N: Ignoring file '50unattended-upgrades.ucf-dist' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension^M
N: Ignoring file '50unattended-upgrades.ucf-dist' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension^M
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-6-generic /boot/vmlinuz-4.4.0-6-generic^M
update-initramfs: Generating /boot/initrd.img-4.4.0-6-generic^M
sed: can't read /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth: No such file or directory^M
E: /usr/share/initramfs-tools/hooks/plymouth failed with return 2.^M
update-initramfs: failed for /boot/initrd.img-4.4.0-6-generic with 2.^M
run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 2^M
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-4.4.0-6-generic.postinst line 1027.^M
dpkg: error processing package linux-image-4.4.0-6-generic (--configure):^M
 subprocess installed post-installation script returned error exit status 2^M
[..]
"""
and indeed, in plymouth-theme-ubuntu-text/xenial,now there is no /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth on a /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth*.in*