How can i access my encrypted hard drive on another pc?

Solution 1:

You don't have cryptsetup installed on your second computer, install it via: sudo apt-get install cryptsetup

Once you've installed it, double click on the encrypted volume again and it should mount for you.

[Edit]
The error from your mount command mount: unknown filesystem type 'LVM2_member' tells us that it's an LVM group, and needs to be mounted slightly differently.

Hopefully the following will provide the information you need to get it mounted, based upon my system.

$ sudo pvs
PV         VG     Fmt  Attr PSize  PFree
/dev/sda2  ubuntu lvm2 a--  99.51g    0 

This tells us that the volume, ubuntu is on the physical volume /dev/sda2. We then need to use the lvdisplay command to list the logical volumes in the group.

$ sudo lvdisplay /dev/ubuntu
--- Logical volume ---
  LV Path                /dev/ubuntu/swap
  LV Name                swap
  VG Name                ubuntu

<snip>

  --- Logical volume ---
  LV Path                /dev/ubuntu/home
  LV Name                home
  VG Name                ubuntu

<snip>

  --- Logical volume ---
  LV Path                /dev/ubuntu/root
  LV Name                root
  VG Name                ubuntu

<snip>

From the above we can see that I've got a home, root and swap. To mount the home partition from this group I would run the following command:

$ mount /dev/ubuntu/home /mnt/disk

If you're unsure how to modify this to suit your needs, edit your question again with the output of the pvs and lvdisplay commands. You might want to take a look at Formatting Help as well.

Solution 2:

If you've gotten this far

i finally managed to get into my encrypted hard disk drive and inside my home folder there are two icons. One text saying README and a weird purple thingy saying ACCEESS-YOUR-PRIVATE-DATA-DESKTOP.

It means you still have your home folder encrypted, with eCryptFS. Now you need to run the ecryptfs-recover-private script and it should search for any encrypted homes (or you can point it at your encrypted home files) and ask you for your old user passphrase, or the backup copy of the master passphrase you should have made when you set up your home encryption, and then it should mount your encrypted home (probably in /tmp/ecryptfs.XXXXXXXX) so you can read / back them up. May be mounted as another user, so probably will need to read as root.

If it errors out while searching, that's ok since you are already looking at your "dummy" home files "README" & "ACCEESS-YOUR-PRIVATE-DATA.desktop", which are usually in /[mountpoint]/home/[username] so just look in the /[mountpoint]/home/ folder for your encrypted files, which should be in /[mountpoint]/home/.ecryptfs/[username]/.Private and pass that to the ecryptfs-recover-private script.

See man ecryptfs-recover-private for more info.

ProTip: ALWAYS make BACKUPS of important data, and encryption keys/headers, so you'll never have this problem again