I think I have the same problem. I did a fresh install of 20.04 on a Lenovo Carbon X1 6th gen. Previously it was working fine under 18.04.
The 20.04 install ran perfectly, and at first the system booted up and ran normally. Shortly afterward I got a notice about a Thunderbolt firmware update from Lenovo. After I installed the firmware update, Plymouth started hanging. The bug occurs when an external monitor is plugged in. Removing splash option in grub fixes the problem. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1871641 Title: Ubuntu never finishes booting: A start job is running for Hold until boot process finishes up (3min 7s / no limit) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1871641/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
