apt-get/dpkg interruption checker

# Background

Ubuntu ships with a tool called `unattended-upgrade` which periodically installs security patches. However, we've observed some cases where auto-upgrade can stop on some machines. One of the reason is that last upgrade was aborted, leaving `dpkg` in an intermediate state. It requires human interaction to fix such state.

# Design

* Check `dpkg` locks to see if it's held for too long.
* Check `apt-get`/`dpkg` logs for last failure details.

Inspect the existing kdebug troubleshooting checks and review how Ubuntu exposes dpkg locks and apt-get/dpkg failure logs. Define how long a lock must be held and what failure details should be reported; done means the tool detects interrupted package state and surfaces actionable evidence.

Scritto dal modello di indicizzazione a partire dal testo della issue.