When the linux package is upgraded, the modules for the old version are removed even if that version is still running.

This is a problem because modules can be loaded dynamically as needed. For example, the udf module when a DVD is mounted. If the linux kernel has been upgraded before mounting a DVD for the first time since boot, the udf module cannot be obtained and mounting is infeasible.

This should be rectified by causing the modules in the linux package not to be removed on upgrade if they correspond to the running version. Instead, the module directory should be marked for deletion. A script running at boot can then remove any old modules marked for deletion where they do not correspond to the running version.