I've experienced a similar issue with 18.04.4 LTS on a Dell Precision 3540. It will hang at "loading initial ramdisk", for all kernels and also for recovery mode. Also hangs at resume from sleep. However, it occurs nondeterministically: sometimes it starts, sometimes it hangs, I have not yet recognized a pattern. When it hangs, it seems to also hang on subsequent restarts, and only resolve when I enter BIOS setup before next restart. Yesterday, it simply didn't restart at all, until I added "dis_ucode_ldr". I've installed intel-microcode_3.20191115.1ubuntu0.18.04.3, and it starts now, but as it occurs nondeterministically, I have to wait and see. If there's any useful information I can contribute, tell me how to obtain it, and I'll post it here ;)
I've experienced a similar issue with 18.04.4 LTS on a Dell Precision 3540. It will hang at "loading initial ramdisk", for all kernels and also for recovery mode. Also hangs at resume from sleep. However, it occurs nondeterministi cally: sometimes it starts, sometimes it hangs, I have not yet recognized a pattern. When it hangs, it seems to also hang on subsequent restarts, and only resolve when I enter BIOS setup before next restart. Yesterday, it simply didn't restart at all, until I added "dis_ucode_ldr". I've installed intel-microcode _3.20191115. 1ubuntu0. 18.04.3, and it starts now, but as it occurs nondeterministi cally, I have to wait and see. If there's any useful information I can contribute, tell me how to obtain it, and I'll post it here ;)