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I had 12.04 with my dual boot system. Yesterday I downloaded Ubuntu 12.10 make bootable USB and choose Upgrade option in Installer. After installation Grub failed to boot my machine. I tried following to fix grub bootloder . Same problem I fixed with Ubuntu 12.04 using live USB but this solution not work for Ubuntu 12.10. Now coming at exactly where this solution goes fail.

I followed this steps after booting Live USB and opening terminal.

1) sudo fdisk -l to see where Linux is installed

2) sudo mount /dev/sda9 /mnt where sda9 is my linux partition

3) sudo mount /dev/sda9 /mnt/boot

4) sudo mount --bind /dev /mnt/dev

5) sudo chroot /mnt (No problems with this steps done perfectly)

6) grub-install /dev/sda when I type command I got error that

source_dir doesn't exist Please specify --target or --directory

How can I solve this ?

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Did you try the Boot-Repair ? –  NikTh Oct 20 '12 at 4:54
    
Oh , just answered to your question.. hah. Can you provide the link with boot-info ? –  NikTh Oct 20 '12 at 4:57
    
I worked with terminal so didn't get screenshot. –  K.K Patel Oct 20 '12 at 5:01
    
Boot-Repair is not a CLI program is a GUI program. Are sure you ran it ? Boot again from LiveCD-USB and run again boot-repair. It will create a boot-info link with useful informations. Edit your question and add this link. –  NikTh Oct 20 '12 at 5:06
    
I want to repair with just with Live USB. In 12.04 I had fixed problem with this but problem occurs with 12.10 Only –  K.K Patel Oct 20 '12 at 5:08
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2 Answers

For general boot problems (even specific problems UEFI - GPT) with grub-boot-loader you can use the Boot-Repair program from a LiveCD-USB of Ubuntu.

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Thanks. making Repair disk is best solution –  K.K Patel Oct 23 '12 at 6:28
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up vote -1 down vote accepted

Boot repair disk is the best solution in boot problems, I ever found.

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