After removing all devices plugged in one by one, Issue seems to be caused by my USB dongle needed for my wireless keyboard and mouse...
I've seen report online see below https://askubuntu.com/questions/884199/grub-freezes-when-logitech-unifying-receiver-plugged-in https://h30434.www3.hp.com/t5/Notebook-Operating-System-and-Recovery/Linux-Spectre-x360-13-late-2019-does-not-work-with-Linux/td-p/7316977 Those two reports seem limited to my hardware, could be HP BIOS. the recommended workaround is to enable Legacy Mode which isn't acceptable for me since it requires to disable Secure Boot. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1866852 Title: System Display black screen on reboot or after a clean shutdown with USB-C Dock Monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1866852/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
