Ubuntu uses livecd to fix grub2

Ubuntu uses livecd to fix grub2 first starts with livecd, and then switches to the root permission under the terminal: (If you are not too troublesome, skip this step and add sudo before each step) www.2cto. comsudo-I Next, find the partition where your ubuntu10.04 is located, and use: fdisk... ubuntu uses livecd to fix grub2 first starts with livecd, and then switches to the root permission under the terminal: (skip this step if you are not bothered, and add sudo before each step) www.2cto.com sudo-I. Next, find the partition where your ubuntu10.04 is located and use: fdisk-l to output the following parts: device Boot Start End Blocks Id System/dev/sda1 1 914 7341673 + 12 Compaq diagnostics/dev/sda2 * 915 4967 32554359 7 HPFS/NT FS/dev/sda3 4968 8006 24410767 + 83 Linux/dev/sda4 8007 19457 91980126 + 5 Extended/dev/sda5 8007 14085 48829536 83 Linux/dev/sda6 14086 14328 1951866 82 Linux swap /Solaris/dev/sda7 14329 14344 128488 + 83 Linux/dev/sda8 18485 19457 7815591 B W95 FAT32/dev/sda9 14345 18308 31839232 83 Linux/dev/sda10 18308 18484 82 Linux swap/Solaris has a lot of content, because I am a 3 system --!, The partition where my ubuntu10.04 root directory is located is/dev/sda9. if you are not sure, find the id 83. Mount the root directory of the original system under www.2cto.com: mount/dev/sda9/mnt mount/dev/sda9 to/mnt. of course, you can choose other places, note that if you have a separate/boot partition, you need to mount the/boot file once separately. for example, if your original/boot file is mounted to/dev/sda12, enter mount/dev/sda12/mnt/boot. I didn't separate it here, so I don't need it anymore. Www.2cto.com is the last step: grub-install -- root-directory =/mnt/dev/sda here I wrote grub-install-root-directory =/mnt/dev/sda9 as my own claim at the beginning, do not learn from me ,--! If you see Installation finished. No Error Reported. it indicates that it has been successful! Restart and check if the familiar grub boot screen is back again? Finally, I liked the powerful man. the first time I fixed grub, it was basically solved by man.