I just installed Ubuntun 20.04 on a Dell Latitude 7400 on DualBoot.
I had to remove the RST as mentioned on this post : https://discourse.ubuntu.com/t/ubuntu-installation-on-computers-with-intel-r-rst-enabled/15347
It works but now I need to test 5 or more times to boot.
After the grub screen, most of the time i have a black screen.
Sometimes I have this error :
Initramfs unpacking failed: Decoding failed
And then it starts.
here is a file called
MODULES=most BUSYBOX=auto COMPCACHE_SIZE="" COMPRESS=lz4 DEVICE= NFSROOT=auto RUNSIZE=10%