[Ubuntu] How to delete SWAP partition during Ubuntu install

When it complains a RAID device is still in use (typically SWAP). 

Step-by-step guide

1. Alt+F2 (to bring up a console)
2. Check the md label running for swap partition using 'ls -l /dev/md'
3. Use the corresponding md# with 'swapoff /dev/md###'
4. Go back to installer and delete the partition

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