Distribution Upgrade needs to give option to restart if network connection is lost

[xrayA4T]

Binary package hint: update-manager

Upgrading from 10.10 -> 11.04
To reproduce:
1. Start Distribution Upgrade.
2. Follow wizard until Getting New packages starts to download the new packages
3. Disconnect network

Expected Behavior
1. Ask user if they want to retry Getting packages (allowing the user to restore network connectivity)
2. If yes, restart the upgrade process at Getting New Packages
3. If no, reverse upgrade as currently happens

Actual Behavior:
The upgrade is reversed

As it take quite a long time before packages start to get download, it is painful to have to restart the upgrade is network is temporarily lost.

[RedSingularity (redsingularity)]

Sorry for the delay. I will test this and report back with results as soon as possible.
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Ubuntu Bug Squad volunteer triager
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[RedSingularity (redsingularity)]

Confirmed. The upgrade process automatically reverses if the network connection is broken for more than, roughly, 20 seconds.

Thanks for the detailed report with reproduction steps. Much appreciated!
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Ubuntu Bug Squad volunteer triager
http://wiki.ubuntu.com/BugSquad