This also happened to me today. I was installing updates and had a Hitachi 250GB external hard drive mounted. I unmounted the drive while updates were in progress and now my update manager is stuck at "unpacking replacement linux-image-2.6.35-25-generic...".
This also happened to me today. I was installing updates and had a Hitachi 250GB external hard drive mounted. I unmounted the drive while updates were in progress and now my update manager is stuck at "unpacking replacement linux-image- 2.6.35- 25-generic. ..".