Comment 111 for bug 1922342

My thumb-drive K does not boot on
- hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)
- hp dc7900 (c2d-e8400, 4gb, intel 4 series integrated i915)
as it stands now.. (No big news as dc7700 & dc7900 usually react the same; but confirmed it won't boot on dc7900)

Likely not required; but again
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guiverc@d960-ubu2:~/uwn/issues/735$ xorriso -indev stdio:/dev/sdb -report_system_area plain
xorriso 1.5.4 : RockRidge filesystem manipulator, libburnia project.

libburn : SORRY : Failed to open device (a pseudo-drive) : Permission denied
xorriso : FAILURE : Cannot acquire drive 'stdio:/dev/sdb'
xorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE'
--
Executed
--
[sudo] password for guiverc:
root@d960-ubu2:~# echo $'\x80' | dd of=/dev/sdb bs=1 count=1 conv=notrunc seek=446
1+0 records in
1+0 records out
1 byte copied, 0.000132766 s, 7.5 kB/s
root@d960-ubu2:~#
--

Safely ejected thumb-drive; tested and it NOW BOOTS ON
- hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)
- hp dc7900 (c2d-e8400, 4gb, intel 4 series integrated i915)

I only booted to maybe-ubiquity|try/install then used sysrq-REISUO. If you needed me to complete boot & shutdown like a user, you'll have to ask me to do that.

I tested boot again on
- dell [optiplex] 755 (c2d-e6850, 5gb, amd/ati radeon rv516/x1300/x1550)
- dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)
and sysrq-REISUO when it reached maybe-ubiquity|try/install

The following would NOT BOOT thumb-drive K now
- sony vaio svp112a1cw (i5-9400u, 4gb, intel haswell-ULT)
(I didn't get it to boot on samsung 700t1c-p10aat either, but I can't rule out me; as I find that device a pain booting external media)

Inserting thumb-drive K into my primary box
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guiverc@d960-ubu2:~/uwn/issues/735$ xorriso -indev stdio:/dev/sdb -report_system_area plain
xorriso 1.5.4 : RockRidge filesystem manipulator, libburnia project.

libburn : SORRY : Failed to open device (a pseudo-drive) : Permission denied
xorriso : FAILURE : Cannot acquire drive 'stdio:/dev/sdb'
xorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE'
guiverc@d960-ubu2:~/uwn/issues/735$ xorriso -indev stdio:/dev/sdb -report_system_area plain
xorriso 1.5.4 : RockRidge filesystem manipulator, libburnia project.

libburn : SORRY : Failed to open device (a pseudo-drive) : Permission denied
xorriso : FAILURE : Cannot acquire drive 'stdio:/dev/sdb'
xorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE'

guiverc@d960-ubu2:~/uwn/issues/735$ sudo xorriso -indev stdio:/dev/sdb -report_system_area plain
[sudo] password for guiverc:
xorriso 1.5.4 : RockRidge filesystem manipulator, libburnia project.

xorriso : NOTE : Loading ISO image tree from LBA 0
xorriso : UPDATE : 940 nodes read in 1 seconds
libisofs: NOTE : Found hidden El-Torito image for EFI.
libisofs: NOTE : EFI image start and size: 1782345 * 2048 , 8496 * 512
xorriso : NOTE : Detected El-Torito boot information which currently is set to be discarded
Drive current: -indev 'stdio:/dev/sdb'
Media current: stdio file, overwriteable
Media status : is written , is appendable
Boot record : El Torito , MBR protective-msdos-label grub2-mbr cyl-align-off GPT
Media summary: 1 session, 1784635 data blocks, 3486m data, 4146m free
Volume id : 'Ubuntu 22.04 LTS amd64'
System area options: 0x00004201
System area summary: MBR protective-msdos-label grub2-mbr cyl-align-off GPT
ISO image size/512 : 7138540
Partition offset : 16
MBR heads per cyl : 0
MBR secs per head : 0
MBR partition table: N Status Type Start Blocks
MBR partition : 1 0x80 0xee 1 15630335
GPT : N Info
GPT disk GUID : cfe88ff9575b6a418e0fa695d43fc159
GPT entry array : 2 248 separated
GPT lba range : 64 15630272 15630335
GPT partition name : 1 490053004f003900360036003000
GPT partname local : 1 ISO9660
GPT partition GUID : 1 cfe88ff9575b6a418e0ea695d43fc159
GPT type GUID : 1 a2a0d0ebe5b9334487c068b6b72699c7
GPT partition flags: 1 0x1000000000000001
GPT start and size : 1 64 7129316
GPT partition name : 2 41007000700065006e006400650064003200
GPT partname local : 2 Appended2
GPT partition GUID : 2 cfe88ff9575b6a418e0da695d43fc159
GPT type GUID : 2 28732ac11ff8d211ba4b00a0c93ec93b
GPT partition flags: 2 0x0000000000000000
GPT start and size : 2 7129380 8496
GPT partition name : 3 4700610070003100
GPT partname local : 3 Gap1
GPT partition GUID : 3 cfe88ff9575b6a418e0ca695d43fc159
GPT type GUID : 3 a2a0d0ebe5b9334487c068b6b72699c7
GPT partition flags: 3 0x1000000000000001
GPT start and size : 3 7137876 600
GPT partition name : 4
GPT partition GUID : 4 8e2bdedd63554344a8fad7869da92b5a
GPT type GUID : 4 af3dc60f838472478e793d69d8477de4
GPT partition flags: 4 0x0000000000000000
GPT start and size : 4 7139328 8490945

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BUT PLEASE DO NOTE I didn't complete a single boot; using Sysrq-REISUO to shutdown when it reached maybe-ubiquity dialog. If you need a user-type full boot & shutdown; just ask.