I know there are a bunch of questions similar to mine, but I don't know what went wrong and how to fix it :(
Now, some back story. I have managed once to install Ubuntu with my Surface Pro 4 on an micro SSD card a few months ago as a test. After the test was successful, and after a few months, I bought a proper SSD card to properly use it.
But now grub doesn't work any more.
The checklist:
- Disabled secure boot
- Make sure that the EFI files are in the first partition of the /dev/nvme* drives, not on /dev/sda
- Then tried to use boot repair which seemed only to understand the /dev/sd* partitions (log here).
- Attempt to reinstall Ubuntu tells me clearly that the partition already has Ubuntu there.
- Formatting the dist and reinstalling Ubuntu, still no luck
- Trying 18.04 and 19.10 and again still no luck
I don't know what to try next...