apt-get/dpkg interruption checker

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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.

[ArchangelSDY]

Common fix:

apt-get install -f

[ArchangelSDY]

1. Detect lock
2. Extract last failure logs
3. Suggest common fixes

Debian only.