Hi - I believe I'm experiencing this issue on my Thinkpad X1 Extreme (Gen1). I set up a dual-boot, Ubuntu (Groovy) and Win11 beta. I'd be able to select my OS in a Grub2 menu, after the Lenovo splash screen on start up.
When I was navigating Ubuntu today, I was notified of the available upgrade to 21.04 and went through the steps to upgrade. At the end of the steps, I needed to reboot my machine: 1) Lenovo splash screen 2) Grub2 menu 3) Select Ubuntu 4) Screen goes black and is unresponsive 5) Hold power to shutdown/restart After noticing the issue with booting into Ubuntu, I tried to boot into Windows and experienced the same issue - black, unresponsive screen. I tried several times to boot Ubuntu in recovery mode via advanced options and no dice. This is a really crummy issue that's rendered my laptop unusable. -D. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1925010 Title: shim-signed 15.4 does not boot on EFI 1.10 systems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim/+bug/1925010/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
