Lenovo Thinkcenter Edge71 Ubuntu Install and Boot Fix error 1962 no operating system found

Research Links

• Boot Repair paste link: https://pastebin.ubuntu.com/p/KjFfSkN3xg/  expires: 2-18-2026
• LocalCopy: boot repair:  Boot-Repair-2-15-2026.txt
• Boot-Repair-Disk, the 'must-have' rescue CD  –  This appears to be the same method to Note 6 below
• GAI: error 1962 no operating system found no csm setting in bios
• FW DOWNLOAD: Lenovo Support: Flash BIOS update – ThinkCentre M71e and ThinkCentre Edge 71

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. 

• Perp: I am installing ubuntu linux on a lenovo thinkcenter edge71 desktop. lenovo error 1962 no operating system found no csm setting in bios. When i interrupt startup by pressing enter then f12 to access "startup device menu" I see the disk. There is no uefi or csm setting. how can I insure legacy mode?
• Perp: At bios time in boot up sequence I see error 0135 cpu fan failure. But the CPU fan is spinning. The power supply fan spins for a little bit and stops
• ———-
• Perp: what motherboard was used in the thinkcentre edge71 computer?
• Perp: Step by step guide to install Ubuntu legacy mode on Lenovo ThinkCentre Edge 71 – last entry see below 

Post-Install Fixes

If no boot (Error 1962), boot live USB (F12 Legacy), open Terminal:
sudo mount /dev/sda1 /mnt (adjust /dev/sda1 to root partition via lsblk).
sudo grub-install --target=i386-pc /dev/sda
sudo update-grub
Reboot. Verify Legacy mode: ls /sys/firmware/efi (should fail). 

• GAI: ubuntu grub install error failed to get canonical path of cow – I tried the grub-install above using the installation USB stick but it has a conflict done that way.   Suggested using Live USB stick.

Notes

1. Unit had Win 10 installed. 
2. Installed Ubuntu from USB flash install drive – after install error flagged
3. error 1962 no operating system – occurs at boot up. 
4. BIOS date: 2-14-2014    Version 9QKT37AUS
5. I can not find: CSM (Compatibility Support Module) in the BIOS
6. I tried the boot repair method: Ubuntu.com: Error 1962: no operating system found after installing 12.04 (Lenovo ThinkCentre) – see below.  This page has many other methods tried by flailing users.
7. I tried installing Mint Linux on a fresh disk.  It had the same symptom.

I had the same issue and the following worked for me:

1. Run ubuntu from installation disk

2. 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 &)
   

3. just choose the "Recommended Repair"

4. boot from harddisk installation
5. repeat steps 1-3
6. restart.

it should work now.  ( It does not work )

The following partition is what was on the Ubuntu 500GB Seagate that I installed Ubuntu on. 

• SDA – is the 500 gb hard drive
• SDB – is the 64 gb USB stick used for Ubuntu installations

lrGzAQ8o