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I attempted to increase c-drive memory by using a partition tool,earlier i had my system dual boot(window8.1 and ubuntu 15)now after doing the partition using partition tool when i start my computer it shows

GNU GRUB version 2.02^beta2-9ubuntu1

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 help me solve this problem,how can i get both mu windows and ubuntu back

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1.Boot with Ubuntu Live CD or USB.

2.Find your ubuntu partition:
sudo blkid

Mine show /dev/sda1

[~] : sudo blkid 18:05:04 /dev/sda1: UUID="122d2898-41c4-4d0b-a6e3-efdabacc0910" TYPE="ext4" PARTUUID="b342201c-01" /dev/sda2: LABEL="ssd2" UUID="10A1139E10A1139E" TYPE="ntfs" PARTUUID="b342201c-02" /dev/sdb1: LABEL="64Win7" UUID="01D25439F551BF10" TYPE="ntfs" PARTUUID="f0b1ebb0-01" /dev/sdb2: LABEL="RELAX" UUID="9626FEB726FE9787" TYPE="ntfs" PARTUUID="f0b1ebb0-02" /dev/sdc1: LABEL="CLGT" UUID="E4481765481735B0" TYPE="ntfs" PARTUUID="c887c887-01" /dev/loop0: UUID="c901eeeb-0431-40dd-bac7-6ced930103b1" TYPE="xfs" /dev/mapper/docker-8:1-1327350-pool: UUID="c901eeeb-0431-40dd-bac7-6ced930103b1" TYPE="xfs"
3.Then rebuild your grub config: sudo mount /dev/sda1 /mnt sudo mount --bind /dev /mnt/dev sudo mount --bind /dev/pts /mnt/dev/pts sudo mount --bind /proc /mnt/proc sudo mount --bind /sys /mnt/sys sudo chroot /mnt grub-install /dev/sda grub-install --recheck /dev/sda update-grub
4.Reboot and you can use Ubuntu as normally.

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