Confirming that cosmic does setup a disco chroot correctly.
$ ls -altr /run/schroot/mount/disco-amd64-39c1df8a-06d8-4dd7-a799-f38bf8fb6ec3/sbin lrwxrwxrwx 1 root root 8 Oct 31 15:55 /run/schroot/mount/disco-amd64-39c1df8a-06d8-4dd7-a799-f38bf8fb6ec3/sbin -> usr/sbin
Confirming that cosmic does setup a disco chroot correctly.
$ ls -altr /run/schroot/ mount/disco- amd64-39c1df8a- 06d8-4dd7- a799-f38bf8fb6e c3/sbin mount/disco- amd64-39c1df8a- 06d8-4dd7- a799-f38bf8fb6e c3/sbin -> usr/sbin
lrwxrwxrwx 1 root root 8 Oct 31 15:55 /run/schroot/