I did make a new installation media with Rufus this time specifically specifying MBR partitioning and selecting the "Solutions for old BIOS" option. The Legacy Server Ubuntu image can be downloaded here. Strangely enough, because I would expect that the Ubuntu Installer would properly embed an UEFI or Legacy installation option but it did not. Apparently there is a "legacy installer" Ubuntu ISO. Then I found this answer which hints even more in the right direction. Also the article was based on the graphical installer for the desktop version, not the server version. I tried, it gave me a slightly different installation but again resulted in the same issue. , the article pointed out to use Universal USB Installer instead of Rufus for the BIOS compatible installation. This cost me too many hours and thanks to the comment of Robert on the question he did point me to the right direction a possible UEFI issue.Īfter reading a lot and realizing that the bios A09 has very limited options and that Windows was possibly installed in legacy mode. What can possibly be wrong here? What am I missing? Who has the golden answer? I did this whole installation process several times, switching back and forth between Windows and Ubuntu installers and I can't get Ubuntu to boot while Windows boots fine. And I intend to use this laptop CLI only anyway without special GPU need. Also, GPU seems to work at least normal in the Windows GUI. I did run other benchmarking and testing tools in Windows 10 on that laptop such as BurnInTest and they only show some warnings on GPU which I think has not much to do with the "No bootable OS detected". Anyway, the bios is also extremely limited and does not even have a "secure boot" option. I thought of the TPM chip because I recall this laptop very long ago suddenly got Bitlocker issues but maybe that was a Bitlocker setup without TPM at the time. I am not sure if this laptop is supposed to have a TPM chip and if this can cause any issues but I cannot detect any TPM chip in Windows. Just for the sake of it I did another attempt with the same image using BalenaEtcher instead of Rufus also without success. And as suggested by I also tried specifically the Rufus option "GPT and EUFI (no CMS)" and also I tried the Rufus option "MBR with legacy bios support". I also tried the Ubuntu installation with and without the HWE kernel. I also tried the installation from two different USB-sticks and from two different USB ports on that laptop. I verified that the downloaded image: MD5: 8df52f27204c37a50a169989fb019188 is correct and with Rufus 3.17 I tried the ISO- and DD-mode when writing to the device. I tried to change the ATA/AHCI options, resetting the BIOS to defaults, clearing the CMOS battery and disconnecting the internal battery. Which also did not solve the issue and did not make any difference. But just to be sure I downgraded the problematic laptop back to A9 (the last downloadable BIOS, ). Both A10 and A12 don't seem downloadable anymore. I have an identical L5112Z laptop running ZorinOS (Ubuntu based), I checked for any differences in BIOS and I noticed a different version, the Zorin laptop is running bios version A10. BIOSĪlso, I noticed the BIOS running was A12 which seemingly isn't downloadable anymore from Dell. I also ran the full built-in Dell diagnostics tool without any issues except a warning on the life of the battery. I also did a full physically checkup, took the whole thing apart and put it back together, no physical obvious hardware issues found. I tried a setup with LVM group and without, both encrypted and not encrypted. All the drives I tried are recognized in the BIOS and in the Ubuntu installer. So, I tried the same installation with several other hard drives (both SSD and HDD) without any success. I read a load of forum posts on this and related and tried most if not all solutions, most are referring to potential hardware failure. Now the worst part, I use an USB Windows installer generated using the Windows 10 Media Creation tool and Windows 10 installed flawlessly and boots without problems. Then when I reboot I get a "Operation System not found". I can boot from USB, start the Ubuntu installation and finish it without any problems. I am trying to install Ubuntu-20.04.3-live-server-amd64 on one of those laptops using a RUFUS 3.17 (ISO-made) USB-stick. I have two identical Dell XPS L5112Z laptops. TL DR: I have a Dell XPS L5112Z that boots perfectly fine after a fresh Windows 10 installation but is stuck at "Operation System not found" after a fresh Ubuntu 20.04 installation.
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