My Lenovo P50 can't boot Linux.
I have Windows 10 installed on my SSD (with BitLocker -- I tried deactivating that before Linux installation, without any success). I used its Disk Manager to split the main SSD in two, and the second HDD also in 2.
Then I booted on my USB stick and installed my Linux distribution (tried several versions of Ubuntu up to 18.10 & Mint up to 19.1) choosing SSD for /, HDD for /home and /dev/sda (SSD) for grub. The installation process works OK. Live Linux works perfectly fine, but when I'm rebooting the laptop hangs on a grub prompt. The only option I found so far is exit which then brings me to a BIOS boot menu where I can select between Windows Boot Manager, Linux Xxx and any other bootable device (my USB stick, etc.).
If I choose Linux Xxx, it turns to a black screen and goes back to that grub prompt. If I choose Windows... it boots fine.
Where could the problem be? What kind of grub command or option could I try? Where should I look for eventual logs? How can I "debug" or provide you with more details so we can fix the problem?
FYI, this is not a duplicate of "How to get info on my current GRUB / boot configuration?". I am booting with EFI, I have an ESP (https://help.ubuntu.com/community/UEFI#Creating_an_EFI_System_Partition), I'm using GPT.
grub2 is launched but in "prompt" mode. And none of the options I tried except "exit" are offering any solution. Lately, I tried to run boot, but it complains that I must first load the kernel. I have no idea about how to do this.
I assume there is also something to do with bcdedit, but I'm not very familiar with it and I'm afraid I could break the entire system messing with it.
