Hi Peter,
> Can anyone tell me how I can upgrade the system from a CD, using
> command line instructions?
You can do it from an alternative CD.
https://help.ubuntu.com/community/NattyUpgrades#Upgrading%20Using%20the%20Alternate%20CD/DVD
Although if you upgrade is underway but didn't complete then you may
something like the normal
sudo apt-get dist-upgrade
picks up from where it got to, assuming the machine has network access.
Cheers,
Ralph.
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