Call for testing the current daily Groovy iso files
The current daily Ubuntu Groovy iso file is modified, so that it gets a valid GUID partition table (GPT).
Code:
$ ls -l groovy-desktop-amd64.iso
-rw------- 1 sudodus sudodus 2936969216 okt 9 21:15 groovy-desktop-amd64.iso
$ md5sum groovy-desktop-amd64.iso
00cbcce8855c00dd2231077e3a01aebc groovy-desktop-amd64.iso
$ sudo gdisk groovy-desktop-amd64.iso
[sudo] password for sudodus:
GPT fdisk (gdisk) version 1.0.3
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Command (? for help): q
After this modification a USB drive with the system cloned from the iso file can boot also problematic Lenovo V series computers, for example my Lenovo V130 laptop, in UEFI mode with secure boot.
I checked that it works also in a Dell Precision M4800 both in BIOS mode and UEFI mode.
There have been many modifications of the boot structure of the Groovy iso files. There may be regressions for computers, that we (the testers involved in squashing the bug) have not tested. Please wait for the next daily Groovy iso file of your favourite flavour of Ubuntu, and test that it can boot correctly in the computers, where you want it to work.
The iso file must be released at or after Oct 9 21:15 for this modification to be there.
Edit 1: See the long story at Bug #1886148 - failure to boot groovy daily
Edit 2: More tests - here is a list of all computers tested by me with the current Ubuntu Groovy system cloned from the iso file. Please note that tested mode shows what is tested, and a missing mode does not indicate failure, only that it was not tested. Booting was successful in all these tests performed today, 2020-10-10.
Computer spec - tested mode
----------------------------------------
Lenovo V130 - UEFI mode secure boot
Lenovo X131e - UEFI mode
Dell Precision M4800 - BIOS & UEFI modes
Dell Latitude E7240 - BIOS & UEFI modes
HP Probook 6450b - BIOS mode
Toshiba Satellite Pro C850-19W - BIOS & UEFI modes (also with secure boot)
VirtualBox 6.1.10_Ubuntu r138449 - iso file emulating optical disk - BIOS mode