[Merge] lp:~brian-murray/ubuntu-release-upgrader/cleanup-debs into lp:ubuntu-release-upgrader

[Brian Murray]

Brian Murray has proposed merging lp:~brian-murray/ubuntu-release-upgrader/cleanup-debs into lp:ubuntu-release-upgrader.

Commit message:
This change will remove debs from apt's "Dir::Cache::archives" folder after the upgrade has completed successfully. Its worth mentioning that the same code exists in unattened-upgrades. This is a band-aid for bug 1783597 (free disk estimate doesn't account for snaps) - by freeing space in what is likely the systems "/var" directory we are avoiding the need to calculate free space because the debs and snaps end up on the same file system.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~brian-murray/ubuntu-release-upgrader/cleanup-debs/+merge/351884
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~brian-murray/ubuntu-release-upgrader/cleanup-debs into lp:ubuntu-release-upgrader.
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