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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