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

[Balint Reczey]

Review: Needs Fixing

Please fix /etc/update-motd.d/91-release-upgrade to work as a normal user rather than hacking the executable bit.

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https://code.launchpad.net/~callmepk/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/384183
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