I can confirm that disabling Secure Boot does indeed allow the system to
boot normally.
$ uname -srvp
Linux 5.3.0-23-generic #25~18.04.1-Ubuntu SMP Tue Nov 12 10:58:57 UTC 2019
x86_64
$ sudo od -An -t u1
/sys/firmware/efi/vars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c/data
0
$ inxi -v 1
System: Host: HOSTNAME Kernel: 5.3.0-23-generic x86_64 bits: 64 Desktop:
MATE 1.20.1
Distro: Ubuntu 18.04.3 LTS
CPU: Dual core Intel Core i5-4200U (-MT-MCP-) speed/max: 1044/2600 MHz
Graphics: Card-1: Intel Haswell-ULT Integrated Graphics Controller
Card-2: NVIDIA GK208M [GeForce GT 740M]
Display Server: x11 (X.Org 1.20.4 ) drivers: modesetting (unloaded:
fbdev,vesa)
Resolution: 1366x768@60.00hz
OpenGL: renderer: Mesa DRI Intel Haswell Mobile version: 4.5 Mesa
19.2.1
Drives: HDD Total Size: 250.1GB (5.5% used)
Info: Processes: 208 Uptime: 2 min Memory: 487.5/7845.5MB Client: Shell
(bash) inxi: 2.3.56
As an additional data point, the output of dmesg when dropped to the initramfs
prompt reveals:
...
Run /init as init process
Lockdown: systemd-udevd: Loading of unsigned module is restricted; see man
kernel_lockdown.7
...
FWIW, 5.0.0-36-generic (i.e. the newest 18.04 HWE, non-edge kernel) is
*not* affected by this issue and boots normally with Secure Boot
enabled.
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https://bugs.launchpad.net/bugs/1852581
Title:
hwe-edge kernel 5.3.0-23.25 kernel does not boot on Precision 5720 AIO
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