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I have deleted the partitions of ubuntu from windows and also wrote the command:
from the advanced option which appears after holding the shift key while restarting. But, when I restarted the system, it only showed a Grub terminal mentioning:
Minimal BASH-like line editing is supported. For the first word TAB lists possible command completions. Anywhere else TAB lists possible device or file completions.
Please give some suggestions how can I boot into windows from grub.