Cannot connect to C9 after linux update

Question

My Cloud 9 instance linux was 'Ubuntu 18.04'. I tried to upgrade it to '20.04.6 LTS' from the browser console (Instance->Connect) using the shell command 'do-release-upgrade'. When I launched this command, the command ran for a while and after that the browser connection disconnected. Now, I am not able to connect to this instance anymore. Instance state is showing as running. I tried to reboot it a few times but it still not able to connect.
What I want is:
1. If possible bring the instance back with all data either with 18.04 or 20.04
2. If recovery is not possible then, how can I recover my data from the disk attached to that instance?

Please help

Answer

1. Create a new Cloud9 instance with the OS version you want.
2. Create a snapshot of the root volume of the original Cloud9 instance.
3. Detach the root volume from the original Cloud9 instance
4. Attach the old volume to the new Cloud9 instance. 
5. Mount the old volume at the OS level.

Recommend you create a Data Lifecycle policy for the new instance to automatically create a snapshot.

Cannot connect to C9 after linux update

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