how to remove legal windows 8.1 os from laptop

Rohit01

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Feb 23, 2015
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I want to completely remove pre-installed windows 8.1 from my lenovo laptop.After that i want to instll ubuntu os.Help........
 
That depends on how the recovery stuff is setup. If a disk, no worries. If a second partition, as long as you leave that alone it should be fine. If you repartition the drive, which I didn't say to do, then you might have issues getting windows back on.
 
After the superfish scandal with lenovo I totally understand you.

I would keep the recovery partition and install linux on the windows partition.

Just keep that small recovery partition if you ever want to go back to windows.