opening GParted we get;

 /dev/sada1    EFI system partition     fat32      512.00 MiB    8.84 MiB     
503.16 MiB      boot, esp
/dev/sda2                                               ext4        465.26 GiB  
  15.58 GiB     449.68 GiB
unallocated                                      unallocated    1.02 MiB        
   -                    -

________________________________
From: ubuntu-studio-users <ubuntu-studio-users-boun...@lists.ubuntu.com> on 
behalf of Thomas Pfundt <captain-...@protonmail.ch>
Sent: Sunday, January 19, 2020 11:42 PM
To: Ubuntu Studio Users <ubuntu-studio-users@lists.ubuntu.com>
Subject: Re: [ubuntu-studio-users] Error 1965

Hi,

Ubuntu installer may have selected another drive automatically by error. Which 
may be something developers address?

I'm not even sure where the error lies exactly. I haven't ever experienced this 
myself, but I thought I would mention it, just in case.

The Windows installer tends to order drives upon partitioning seemingly at 
random occasionally, it might also be a BIOS issue on some motherboards to 
begin with.

I've read about Ubiquity (Ubuntu's installer) pre-selecting another drive than 
the one the system is supposed to be installed on for the bootloader, but only 
on manual install. Since this wasn't the case, I would assume the bootloader 
was installed to the correct drive.

There are a ton of possibilities here, let's start with something practical:

Do you have multiple drives installed (also USB)? Enter your computer's boot 
menu and just try booting one drive after another. Maybe the bootloader in fact 
was installed onto the wrong drive, remember which one booted and just set it 
as the boot device in your BIOS.

In case no drive is able to boot, things get a bit more complicated.

First check if you have AHCI or IDE-compatibility mode enabled for your drives 
in your BIOS. You should find it somewhere under SATA/storage options, every 
BIOS is different. Try selecting the other option. Also look for anything like 
"secure boot" or "fast boot" and disable those settings. Try to boot the drives 
again. If that doesn't work, reset everything to what it was.

After that, boot into your Ubuntu live system again, but instead of installing, 
this time select "Try Ubuntu" and follow these instructions:
https://askubuntu.com/a/655828

You have to identify your Ubuntu drive, since it might not be /dev/sda as in 
the example, enter "lsblk" beforehand and look for the drive which has a 
partition marked with a slash "/", that's the one that needs to be used.

After that, reboot and try again.

Now, if all of this doesn't work, since it's a new installation and assuming 
there is no unique data on your system drive yet, because you haven't used it 
(?), you could just re-install the system once more. The issue could also have 
been a broken live system or a (memory) error while installing.

I'd advise you to internally unplug all drives except the one the system should 
be installed on and maybe make a new Ubuntu USB or DVD. Press Shift when you 
boot your Ubuntu live system as you see the keyboard icon. Then select "Check 
disk for errors" before you install to make sure the live DVD or USB is good.

Just go ahead with the installation, there should be only one drive available.

I don't think I can explain any of this much simpler from a distance, if you 
need additional help, is there anybody you can reach with a bit of 
Linux-knowledge or general computer experience who could assist you with this?
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