[Merge] ~callmepk/ubuntu-release-upgrader:ubuntu/master into ubuntu-release-upgrader:ubuntu/master

[Patrick Wu]

The proposal to merge ~callmepk/ubuntu-release-upgrader:ubuntu/master into ubuntu-release-upgrader:ubuntu/master has been updated.

    Status: Needs review => Work in progress

For more details, see:
https://code.launchpad.net/~callmepk/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/384183
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Your team Ubuntu Core Development Team is requested to review the proposed merge of ~callmepk/ubuntu-release-upgrader:ubuntu/master into ubuntu-release-upgrader:ubuntu/master.