Dual Booting LL 2.0 with other Ubuntu (14.04) based distros

[gold_finger]

Shall I still send you a screenshot from Gparted or an output from the terminal (i.e. from sudo blkid).

Yes, go ahead and post a screenshot from GParted showing the partitions on the drive.  (This post describes how to post a screenshot and terminal output if you need that info.)

Sounds like you can not boot into LL 2.0 at this point and the drive currently has only Zorin and LL on it.  Is that correct?  If not, tell us how many OSs are on the drive, which ones they are, and which ones you are able to boot into currently?

If you can boot into LL 2.0, then go ahead and do that.  If not, boot into Zorin and run the commands below.  (Let us know which distro you ran the commands from.)

Code:

lsblk
sudo blkid -c /dev/null
sudo parted -l
sudo os-prober

Just in case we can't tell from screenshot and command output, if you are currently sharing one /home partition between both OSs, let us know that.

I am pretty sure we can get this to work and that you probably just made a slight error in your prior attempt.  Also, just so you know, the boot flag shown in GParted is not something to worry about.  It's my understanding that, unless you have a very ancient BIOS,  Linux just ignores the boot flag.  (I could be wrong, but fairly certain I read that somewhere before.)