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I was following this answer to resolve my boot problem and when running:

sudo mount /dev/sdb /mnt

I get this error:

mount: /dev/sdb already mounted or /mnt busy

The sdb is the drive which has 3 partitions: 

sdb1 fat32 and the flag is set to boot
sdb2 ext4  
sdb3 linux-swap

am I selecting the right disk as stated in that answer?

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Nicolas
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1 Answers1

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If your drive already has partitions with data on them you absolutely do not want to mount the drive. You want to mount the partition:

sudo mount /dev/sdb2 /mnt
DopeGhoti
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  • so mount the boot partition or mount the ext4 ? because the answer says "Determine the partition number of your main partition" which one is the main partition? – Nicolas Apr 15 '16 at 22:42
  • I used `sdb1` as an example; mount whichever partition contains the data you wish to interact with. – DopeGhoti Apr 15 '16 at 22:43
  • I have installed the linux on that drive and I am worried I might remove something, so I should select `sdb2` according to the answer I posted in my question? – Nicolas Apr 15 '16 at 22:44
  • Given that the answer you referenced was talking about your main partition, and that in your OP it is implied that `sdb2` is where your data are, that is probably the partition you want to `mount`. I have edited my answer to reflect this. – DopeGhoti Apr 15 '16 at 22:46
  • thanks, I am in the step 7 and I get this error when I do `grub-install /dev/sdb/` : installing for x86_64-efi platform, grub-install: error: cannot find EFI directory` any idea? – Nicolas Apr 15 '16 at 23:04
  • Comments on an answer are not a venue for this, so I will leave you with this insight: You are again conflating _drives_ and _partitions_. – DopeGhoti Apr 15 '16 at 23:40