Updating from 14.04 to 14.10 created a snapshot, but it did so AFTER updating the sources.

[James Lewis]

Using BTRFS to allow snapshot rollback from version updates actually worked... I updated from 14.04 to 14.10 on Nov 1st, and encountered a problem, I saw that update-manager had taken a snapshot before completing the update, but after rollback I found that the snapshot was taken AFTER the 14.10 sources had been put in place.

Clearly the snapshot should be taken before changes are made to the package configuration, or rollback will not be complete.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1389275

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[James Lewis (james-fsck)]

I cannot provide the output of apport since the issue occurred before the upgrade process which is now complete... however I think it's fairly obvious, this is a procedural issue, not a crash... the BTRFS snapshot needs to happen before it starts making changes to perform the update.

[Tim Gardner (timg-tpi)]

This is probably not a linux kernel bug.

[James Lewis (james-fsck)]

+Tim Gardner

I completely agree, I could swear I put update-manager in the bug originally... I guess it's not a "published" feature that update-manager takes a snapshot before upgrading, and there's clearly no GUI way to roll back, but this is a truely great feature, it saved my bacon so I'm glad it's there, but I thought it was worth reporting that the point where the snapshot is taken is a little too late in the process.