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This usually means Ubuntu did install to the disk, but the firmware is not actually booting from its bootloader (GRUB) or is not seeing the disk as bootable at all.
To narrow it down, I need a bit more detail:
What exact message do you see after POST? (“No bootable device”, “No operating system found”, error code, etc.).
What computer/model and approximate age is it? (e.g., Lenovo Edge 71, HP desktop, laptop brand).
In its firmware/BIOS setup, is the disk visible and listed in the boot order? Is it set to UEFI, Legacy/CSM, or a mix?
While you check that, here is the usual quick path to confirm and repair:
Boot from the same Ubuntu USB, choose “Try Ubuntu”.
In the live session, run lsblk and confirm your internal disk (likely /dev/sda or /dev/nvme0n1) has Ubuntu partitions (ext4, EFI, etc.).?
If the disk is present and looks fine, then:
If the machine is UEFI:
Ensure firmware is set to UEFI (not Legacy-only), Secure Boot preferably off, and that the Ubuntu entry (or an EFI file on the disk) is in the boot list.
If there is a “Select an UEFI file as trusted for executing” option under Security, point it to the \EFI\ubuntu\grubx64.efi on the internal drive, then put that new entry first in boot order.??
If it’s Legacy/BIOS:
Make sure boot mode is Legacy (or CSM) and the internal HDD/SSD is first in the boot order.?
From the live session, you can reinstall GRUB to the disk MBR:
sudo mount /dev/sdaX /mnt (replace sdaX with your Ubuntu root partition)
sudo grub-install --target=i386-pc /dev/sda
sudo chroot /mnt update-grub?
If instead the internal disk does not appear in lsblk or the BIOS/firmware, the problem is lower-level (cable/port, SATA mode like RAID/Optane/RST instead of AHCI, or the drive itself).
Reply with:
Exact model of the computer.
Exact boot error text.
Whether BIOS shows the drive and in which boot mode (UEFI vs Legacy).
With that I can give you a very specific set of steps rather than general possibilities.
It messages "no bootable device". It is a Lenovo Edge 71. The disk is visible in BIOS. There is no setting in BIOS for UEFI or CSM.
On the Edge 71 this almost always means Ubuntu was installed in EFI mode, but the machine can only actually boot in Legacy/BIOS mode, so the disk has no Legacy GRUB in the MBR and the firmware declares “no bootable device”.
What’s going on on this Edge 71
Edge 71 is effectively a Legacy?only box; there is no real UEFI/CSM toggle in BIOS despite some Lenovo docs implying UEFI.
If the installer boots in UEFI mode, it creates an EFI System Partition and installs GRUB?EFI to it, leaving the disk MBR without boot code; a Legacy BIOS like yours then sees the disk but finds no bootable code and throws “no bootable device”.?
You already confirmed:
Disk is visible in BIOS.
There is no UEFI/CSM option.
So the fix is to ensure Ubuntu (and GRUB) are installed in Legacy mode and GRUB is written to the disk’s MBR.
Fix path A: Reinstall Ubuntu in Legacy mode (cleanest)
Recreate the USB installer in pure BIOS/Legacy?bootable form:
Use Ventoy or Balena Etcher instead of Rufus; Rufus often defaults to UEFI?only images that confuse the Edge 71.?
Boot the Edge 71 and tap F12, then explicitly choose the USB entry that looks Legacy (no “UEFI:” prefix; usually just the USB name).
In the installer, again choose Erase disk and install Ubuntu (single?OS).
Let it finish, remove USB when prompted, and it should now boot directly from the HDD because GRUB has been installed to the MBR in Legacy mode.
This is usually the fastest way if you don’t care about keeping the current install.
Fix path B: Convert current install from EFI to Legacy (no reinstall)
If you want to salvage the existing install:
Boot from the Ubuntu USB, choose Try Ubuntu.
In the live session, identify the root partition:
lsblk → find your disk (likely /dev/sda) and the main ext4 partition (for example /dev/sda2).?
Mount it and chroot:
sudo mount /dev/sda2 /mnt (replace with your root).
If you have a separate /boot or others, mount them under /mnt too.
for i in /dev /dev/pts /proc /sys; do sudo mount --bind $i /mnt$i; done
sudo chroot /mnt
Install Legacy GRUB into the MBR:
grub-install --target=i386-pc /dev/sda
update-grub
Exit chroot, unmount, reboot, remove USB.
The BIOS should now see the disk as bootable and GRUB should load.
This is effectively what Boot?Repair did for the person in the UbuntuForums thread with this exact Edge 71 symptom; converting the install to Legacy mode fixed “This is not a bootable disk”.?
One quick check before spending time
Before doing either path, also rule out the silly case where GRUB got written to the USB:
Boot again with the USB inserted, see if you get a GRUB menu and can boot the installed system from there.?
If it only boots when the USB is present, then GRUB was likely installed on the USB and not /dev/sda, and reinstalling GRUB to /dev/sda as in path B is the right move.?
If you tell me:
How you created the USB (Rufus options, etc.).
Output of lsblk from a live session.
I can give you an exact set of commands tailored to your current partition layout (e.g., whether you have a useless EFI System Partition to ignore or reuse).
Please update for the following update response: It messages error 1962 no operating system found It is a Lenovo Edge 71. The disk is visible in BIOS. There is no setting in BIOS for UEFI or CSM.
Error 1962 on the Lenovo ThinkCentre Edge 71 after an Ubuntu "erase and install" means the installer created an EFI System Partition but no GRUB code in the disk's MBR, and since this BIOS is Legacy-only (no UEFI/CSM toggle), it can't find boot code and throws the error even though the disk is visible.
Why this happens on Edge 71
The Edge 71 BIOS (even latest 9QKT39A from 2012) is effectively Legacy/BIOS-only despite Lenovo calling it "UEFI"—it lacks proper EFI boot support, so Ubuntu installers defaulting to EFI mode leave the MBR empty and unbootable.?
Quickest fix: Reinstall in Legacy mode
Recreate USB installer with Ventoy or Etcher (avoid Rufus UEFI defaults).
Power on, tap F12 at Lenovo logo, select the Legacy USB entry (no "UEFI:" prefix).
Install with Erase disk and install Ubuntu.
Remove USB when prompted—it now boots via Legacy GRUB in the MBR.
Salvage current install: Install Legacy GRUB manually
Boot the Ubuntu USB in Legacy mode (F12), choose Try Ubuntu:
sudo apt update && sudo apt install boot-repair boot-repair
Choose Recommended repair. It detects the EFI issue, converts to Legacy GRUB on MBR (/dev/sda), and fixes.
Or manually (if no network):
lsblk # note root partition, e.g. /dev/sda2 sudo mount /dev/sda2 /mnt sudo mount --bind /dev /mnt/dev sudo mount --bind /proc /mnt/proc sudo mount --bind /sys /mnt/sys sudo chroot /mnt grub-install --target=i386-pc /dev/sda update-grub exit sudo reboot # remove USB
This writes GRUB to the MBR exactly as Boot-Repair does.?
Verify success
After fix, in running Ubuntu: ls /sys/firmware/efi should fail (confirms Legacy mode).?
If Boot-Repair paste shows EFI remnants post-fix, purge them with GParted (delete fat32 ESP, resize root partition) but usually unnecessary. This resolved the identical "installs but disk is not bootable" on Edge 71.
Research Links
Ubuntu Linux zip files often fail to open in Windows due to incompatible character encodings, long file paths exceeding 260 characters, or the use of password protection features that default to Linux-only encryption. To fix this, use 7-Zip on Windows, re-create the archive using zip -r -k archive.zip folder/ in Linux to ensure compatibility, or ensure filenames lack special characters like ' ….. more
Yes, 7-Zip archives (.7z) created on Ubuntu are generally compatible with Windows. 7-Zip is a cross-platform tool, and its file format works across Linux, Windows, and macOS.
Here are the key details regarding compatibility:
Compatibility Notes
p7zip (the command-line port in Linux) or the newer native Linux version of 7-Zip can be opened on Windows using the 7-Zip application.
To install 7-Zip on Ubuntu, open the terminal (Ctrl+Alt+T) and run sudo apt update followed by sudo apt install p7zip-full. This provides command-line support for various formats via the 7z command. To add support for RAR files, run sudo apt install p7zip-rar.
Key Commands:
sudo apt install p7zip-full p7zip-rar
7z a archive.7z /path/to/files
7z x archive.7z
7z l archive.7z
For users needing the latest 7-Zip features, the official binary can be downloaded directly from the
When selecting the "Erase disk and install Ubuntu" option in the Ubuntu installer (a "clean install"), the installer automatically partitions the entire drive using the GPT (GUID Partition Table) scheme for modern UEFI systems. It typically creates two or three main partitions to manage boot files, the operating system, and memory.
Here is what a standard, modern (22.04/24.04) "Erase and Install" partition layout looks like:
Typical Modern Layout (UEFI)
/dev/sda1 (or nvme0n1p1): EFI System Partition (ESP)
/dev/sda2 (or nvme0n1p2): Root Partition (/)
Swap:
/swapfile) located inside the root (/) partition
Notes
An EFI partition (or EFI System Partition, ESP) is a small, FAT32-formatted partition on a hard drive or SSD required by UEFI-based computers to boot the operating system. It holds bootloaders, drivers, and system utilities. EFI stands for Extensible Firmware Interface, which is the predecessor to the modern Unified Extensible Firmware Interface (UEFI).
Key Details About Linux EFI Partitions:
/boot/efi.
If you are using a GPT disk, the EFI partition is assigned a specific GUID to help the system identify it.
The following is an Ubuntu Install USB stick partition set
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wpBeginner header
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Here are the main approaches:
Using a Theme Builder Plugin (Recommended for advanced customization):
Plugins like SeedProd or Elementor (with an add-on like Boostify Header Footer Builder) offer extensive drag-and-drop functionality to design custom headers.
Using your Theme's Customizer or Site Editor: Many modern themes, especially those supporting Full Site Editing (FSE), have options in the Appearance > Editor or Appearance > Customize sections.
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By utilizing these tools, you can replicate the desired header style without needing advanced coding knowledge.
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Error 1962 (No Operating System Found) on Lenovo systems indicates the BIOS cannot detect a bootable drive, often due to improper boot order or missing CSM/Legacy mode. If CSM is missing, ensure the BIOS is set to UEFI, change boot priority to UEFI First, check SATA cables, and potentially restore default BIOS settings.
Notes
I had the same issue and the following worked for me:
install and run boot-repair (you need internet access)
sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
sudo apt-get install -y boot-repair && (boot-repair &)
just choose the "Recommended Repair"
it should work now. ( It does not work )
The following partition is what was on the Ubuntu 500GB Seagate that I installed Ubuntu on.
