ubiquity: how can I install ubuntu from /dev/sda2 to /dev/sd3?

Asked by jackson

I boot ubuntu from /dev/sda2 and prepare the partition /dev/sd3.
Now I want to use ubiquity to install ubuntu to /dev/sda3. But it prompts that /dev/sda should be unmounted.

I think that it don't really need everything on /dev/sda to be unmounted.

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Ubuntu casper Edit question
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jackson
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jackson (jacksonjzs) said :
#1

oo, I find the cmmand "d-i ubiquity/partman-skip-umount boolean true "!!