Trying again: I installed grub twice on two drives, how to fix it?

[Grizzly]

03 May 2020  at 9:01, M. Fioretti wrote:
Trying again: I installed grub twic (at least in part)

AFAIK current wisdom (from a similar question I asked) is choose your boot 
drive (SSD in your case) then run 

update grub

I did this myself with less than stellar results (in my case I had two drives 
with 4 OS versions) I should have had grub with (plus the normal Recoverey & 
Ram extras)

19.10
18.04
16.04
Win7

but grub actaully had 

18.04
16.04
14.04

And two of the four choices would not work (hang)

What did work, I (in trun) disconected one drive at a time, booted and run

update grub

now I need to choose boot drive (F12 in my case) but then I have either 

19.10
18.04

OR

16.04
Win7

and all OS's work

In your case it should be easier, once you boot to SSD, you "could" copy your 
old /home to SSD, then format the HD, I've not tried to use a second drive as 
/home so I'll leave others to advise on that

>two months ago, I asked the question below, but got no answers. Then
>lockdowns came, and one of the consequences is that I had no way to
>deal with it anymore. Now things are a bit quieter, and I would really
>like to fix this for good. The problem is still there, exactly as
>described below. Short version:
>
>I had Ubuntu 19.10 on my laptop hd, added an SSD drive to it,
>installed Ubuntu 19.10 on that SSD too. But I did some mistake, so now
>I have 2 working ubuntu installs on both disks, and a grub that lists
>them both, but by default points to the one on the HD. I want to have
>Ubuntu and grub only on SSD, so I can repartition the whole HD drive
>as /home.