Ubuntu won't recognize my SSD

[gabrielabenke]

Hi, I'm totally new to Ubuntu. I have a Windows 10 PC with 3 SSD and I wanted to install Ubuntu over Windows 10. I'm trying to install from the pendrive. The Ubuntu installer couldn't recognize the SSD where Windows 10 was installed, so I ended up installing in the wrong disk. When I restarted the PC, Windows opened instead of Ubuntu. I tried switching the disk setting in the BIOS from IDE to AHCI, but Unbutu Installer still won't recognize the SSD and now Windows won't boot. The PC says I don't have an OS, even though Ubuntu is installed in one of the SSD. What do I do? How to I totally remove Windows from my PC and make Ubuntu work?

[oldfred]

You have to first convert Windows to use AHCI.
Windows AHCI instructions - some have found safeboot method better
https://www.dell.com/community/Lapto...s/td-p/5072571 &
https://askubuntu.com/questions/1233...el-rst-systems &
But if you do a safe boot first, then boot to UEFI/BIOS and change to AHCI and finally boot normally, it works
https://discourse.ubuntu.com/t/ubunt...-enabled/15347 &
https://help.ubuntu.com/rst/

If UEFI installs, you should be able to directly boot Windows from UEFI boot menu.
See also link below in my signature for more UEFI info.

With multiple drives & multiple installs, safest way to install, is to unplug all other drives.
Or you can use Something Else but have to choose drive & partition.
If UEFI make sure drive is gpt partitioned.

Lets see details, use ppa version with your live installer (2nd option) or any working install, not Boot-Repair ISO:
Please copy & paste the pastebin link to the Boot-info summary report ( do not post report), do not run the auto fix till reviewed.
https://help.ubuntu.com/community/Boot-Repair &
https://sourceforge.net/p/boot-repair/home/Home/

[tea for one]

With multiple drives & multiple installs, safest way to install, is to unplug all other drives.
Or you can use Something Else but have to choose drive & partition.
If UEFI make sure drive is gpt partitioned.

Yes, if you have the luxury of multiple drives, I agree that it is safer to only have the target drive available.
Isolate, physically remove or de-activate the drives before installation (many PCs have these settings in the UEFI set-up)

[oldfred]

Many also need UEFI firmware update & SSD firmware update.

Just an example, have seen issue with many brands.
Asus x541ua Update of UEFI & SSD firmware solved issues
https://ubuntuforums.org/showthread.php?t=2414431
https://ubuntuforums.org/showthread.php?t=2420860