I am joining the chorus only to confirm this seems to be related to a specific set of hardware. I got the same result on an Acer Aspire 5, AMD Ryzen 3 3200U with Radeon Vega Mobile Gfx: 5.3.0-40 fails to boot (or fails to boot to the full graphical login) and 5.3.0-29 continues to work just fine.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1863759 Title: CPUs stuck during boot after 19.10 upgrade to 5.3.0-40 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1863759/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
