Need Help with chroot systax, not covered in docs..

[John Foster <jfoster@augustmail.com>]

Here is what I want to do; I have a dual boot system with partitions:
/stable and partition /unstable. I want to mount /unstable to directory
/stable/unstable  after doing so I issue command; 
'chroot /unstable apt-get update'
'chroot /unstable apt-get upgrade'

What happens is that all of the proper files on /unstable are downloaded
and cached in /unstable/var/cache/apt/archives...so far, so good. Then I
get an error message saying

E: Failure running script /usr/bin/apt-listchanges --apt || test $? -ne
10

How do I get past this? If this can be overcome, I think we will have a
remote installation method and recovery method. Any ideas??

Thanks.
John