sudo apt-get upgrade
returns:
Errors were encountered while processing:
linux-image-4.8.0-39-generic
linux-image-4.8.0-41-generic
linux-image-generic
linux-firmware
linux-signed-image-4.8.0-39-generic
linux-image-extra-4.8.0-39-generic
linux-image-4.8.0-37-generic
linux-image-extra-4.8.0-37-generic
linux-signed-image-4.8.0-41-generic
linux-signed-image-4.8.0-37-generic
linux-signed-image-generic
linux-image-extra-4.8.0-41-generic
linux-generic
linux-signed-generic
initramfs-tools
E: Sub-process /usr/bin/dpkg returned an error code (1)
I saw the related questions but their errors were a little different. I don't know if that's significant.