update-manager has some code to see if it is inside a chroot:

def inside_chroot():
    """ returns True if we are inside a chroot
    """
    # if there is no proc or no pid 1 we are very likely inside a chroot
    if not os.path.exists("/proc") or not os.path.exists("/proc/1"):
        return True
    # if the inode is differnt for pid 1 "/" and our "/"
    return os.stat("/") != os.stat("/proc/1/root")

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https://bugs.launchpad.net/bugs/1049223

Title:
  package install failures with uninformative dpkgterminallog files

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