[ubuntu] grub, installing ubuntu in external drive (macbook), Problem

Hollo everyone,
How is your life after getting a grub problem kkkkkk .
My laptop is MacBook pro 2018 (i7 16gb ram)

Here is my problem with details:
I’m trying to install ubuntu 20.04.1 in external SSD (Samsung 5T).
I put 16gb for swap (logical, end of the space) and the rest for Ext4 journaling file system (mount point: /).

It started installing so good until this massage appeared
1.png

That’s when my computer start lagging so I restart it but a new disk appeared ( even the ssd and flash are un plugged)
2.png

This Text comes after I enter it:
3.png

I wrote exit …
I erased the disk and reinstall it again and I got the same problem.
This statement was in installing details:
4.png

But after pressing ok, it didn’t lag, instead I got this massage:
5.png


I was happy at this point.. hhhh :(

till this happened
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it follows in the next post

Attached Images

• 1.png (211.4 KB)
• 2.png (352.9 KB)
• 3.png (411.5 KB)
• 4.png (427.8 KB)
• 5.png (291.4 KB)