I had this same problem happen to me, except on a new install. I noticed that update-initramfs failed initially because of a typo in /etc/initramfs-tools/conf.d/resume:
RESUME=/dev/sdb5\040(delete)
It complained about the '(' so I deleted the whole "(delete)" thing. Ran update-initramfs and added the line to the boot options and it worked fine.
I had this same problem happen to me, except on a new install. I noticed that update-initramfs failed initially because of a typo in /etc/initramfs- tools/conf. d/resume: /dev/sdb5\ 040(delete)
RESUME=
It complained about the '(' so I deleted the whole "(delete)" thing. Ran update-initramfs and added the line to the boot options and it worked fine.