I got the same issue on Thinkpad X1 Carbon 6th & ThinkPad Thunderbolt 3 Dock Gen2
I have seen this issue on other distros like Fedora and Manjaro aswell when using luks and it looks very much that is has something to do with plymouth and kernel version 5.6 and up. I could replicate the issue on focal with kernel 5.8 and 5.9 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1901215 Title: Cannot boot with thunderbolt dock connected before kernel loads To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1901215/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs