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Ubuntu 10.04LTS won't boot after upgrade (Rackspace Cloud)

I had more than once performed upgrade to 10.04LTS and after the classic apt-get update/upgrade, the cloud server refuses to boot up correctly. That's why a daily backup (if not more frequent) is very important.

A lot of times after apt-get update/upgrade a full reboot is not necessary as the services may restart themselves. That's why it is hard to tell exactly which system update might have caused the problem.

Rackspace Support Network / Community has a good article to diagnose the root cause and provide a solution that has fixed my issue.

https://community.rackspace.com/products/f/25/t/999

In essence, the grub configuration may have been messed up so a reconfiguriton of Grub is required.
To do this, we would need to put the server in Rescue Mode. It is like putting a server in single user mode but with network access (so you can still manage it from remote).

Be sure to go through the high quality comments underneath the original post for additional troubleshooting techniques and tips, although the original post worked for my installation just fine.

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