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I want to uninstall win7 from my linux dual boot system and also want to remove booting option so that after removing windows it should automatically boot my ubuntu . So what step should I follow to do that ?

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up vote 2 down vote accepted

Short answer:

  1. Make sure all your data is backed up.
  2. Are you absolutely sure there isn't any data you need on the Windows partition?
  3. Boot from an Ubuntu live CD/USB and run GParted (System / Administration / Partition Editor). Remove the Windows partition and resize the Linux partition to use the whole drive.
  4. Reboot into Linux and run sudo update-grub.

Long answer: https://help.ubuntu.com/community/HowToRemoveWindows

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