Update: disabling TPM is enough to allow boot. >From dmidecode:
Handle 0x000C, DMI type 1, 27 bytes System Information Manufacturer: LENOVO Product Name: 20L8S7X100 Version: ThinkPad T480s Serial Number: xxx UUID: xxx Wake-up Type: Power Switch SKU Number: LENOVO_MT_20L8_BU_Think_FM_ThinkPad T480s Family: ThinkPad T480s -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1843860 Title: 5.3.0-10 doesn't boot on my t480s with secure boot enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1843860/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs