[Merge] lp:~bilalakhtar/update-manager/fix-35009 into lp:update-manager

[Bilal Akhtar]

This branch displays 'Software updates may be available for your computer' when apt-get update hasn't been run for 7 days or more. It also displays below 'The package information was last updated X days ago. Press the 'Check' button below to check for software updates.'
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https://code.launchpad.net/~bilalakhtar/update-manager/fix-35009/+merge/39495
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~bilalakhtar/update-manager/fix-35009 into lp:update-manager.