Error while upgrading from Ubuntu 10.10 (Maverick Meerkat) to 11.04 (Natty Narwhal)

May 6, 2011

Got this error while upgrading from Ubuntu 10.10 to 11.04

The disc drive for / is not ready yet or not present. Continue to wait, press S to skip or M for manual recovery.

Searched for solution and found this Ubuntu bug

Solution given was do run command
sudo apt-get install -f
Reason given was

Broken branding-ubuntu package was causing apt to stop prematurely leaving the system in an inconsistent state.