Dual Booting 2 Manjaro instances

I have Manjaro KDE Unstable running, and thought to install Manjaro KDE-Dev on the same drive. I used Calamares to split my drive, and it seemed to install correctly. However Grub seems to only see the original Manjaro KDE Unstable. Any tips?

$ sudo fdisk -l
[sudo] password for mparillo: 
Disk /dev/sda: 232.9 GiB, 250059350016 bytes, 488397168 sectors
Disk model: TOSHIBA MK2556GS
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 9C84061B-C1FF-4BD8-A0C4-5A8403E95437

Device         Start       End   Sectors   Size Type
/dev/sda1       4097    618497    614401   300M EFI System
/dev/sda2     618498 236078498 235460001 112.3G Linux filesystem
/dev/sda3  471538498 488392064  16853567     8G Linux swap
/dev/sda4  236078500 471538497 235459998 112.3G Linux filesystem

Partition table entries are not in disk order.


Chroot to the new installation and install grub at esp (same esp with old one).
Use the tutorial. Make the command proper, checking with lsblk.

Did you remember to do 'update-grub' at the booted up Manjaro OS (unstable)?

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I am sure petsam's way would have also worked (I did steps 1-4, rebooted without success and I gave up when I thought I had to branch to the UEFI section).

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