Fail to upgrade debian installation in jail

[mgiammarco]

Hello,
I have installed a debian wheezy in a jail using your template and it works.

Now I would like to install ceph 0.72 package that is present in debian unstable.

So I updated sources.list and added testing and unstable repositories.

Unfortunately trying to upgrade fails due to several errors like "file is read only" or others.

I supposed that only kernel was impossible to upgrade in a jail.

Can you help me?

Thanks,
Mario