I think I have a similar issue. After upgrading (to Linux-current 6.0) FDE prompt is not showing -- no boot is happening. I tried the following:
- https://getsol.us/articles/troubleshooting/boot-rescue/en/ -- no broken packages
- Install on a spare SSD -- after upgrade same issue
- Upgrade went well on a Thinkpad laptop (with FDE) and a NUC (no FDE)
- Tried to boot the workstation with the NUC SSD -> worked well
- Tried to downgrade via sudo eopkg history -t #before upgrade to Linux-current 6.0 -- did not work
The issue seems to be with FDE (luks/cryptsetup)
Host: Z170XP-SLI
CPU: Intel i7-7700K (8) @ 4.500GHz
GPU: NVIDIA GeForce GTX 1080