new laptop with UEFI can NOT be booted from Debian 12 on an external USB hard drive

Hi Samuel,

I got a new laptop that has UEFI. It can NOT be booted from my Debian 12 installed on an external USB hard drive (the menu just shows NO Debian option).

But it can be booted from another USB with Debian 12 installer. So I reinstalled the whole Debian 12 on the same USB hard drive. After I completed the installation and reboot the laptop, there is still NO bootable Debian shown.

If you were the right person I am asking, please tell me what to do with my new laptop. If NOT, please refer me to the right person who can help me.

Your help would be highly appreciated.

Henry

Henry Chang <henry.chang212@gmail.com> 於 2025年11月25日週二上午12:08寫道：

Hi Samuel,

Long time no contact, how's everything?

I bought a 5T external hard drive and tried to install Debian 12 on it manually. But I could NOT set up the /root partition as bootable, and the installation program did NOT allow me to set up each partition in EXT4 format.

The partition table I set up is:

/dev/sda1 1k unused (it was created automatically)
/dev/sda2 500M EFI System Partition (ESP):formatted as FAT32
/dev/sda3 20G /root formatted as EXT4, but I could NOT set it as bootable
/dev/sda4 40G /home formatted as EXT4
/dev/sda5 1G formatted as SWAP
/dev/sda6 4.5T /data formatted as EXT4
/dev/sda7 256K unused

The sudo fdisk -l result is:

Disk /dev/sda: 4.55 TiB, 5000981077504 bytes, 9767541167 sectors
Disk model: One Touch w/PW
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 464295B6-9A0B-4A04-B689-AFE30DFF573C

Device Start End Sectors Size Type
/dev/sda1 2048 1026047 1024000 500M EFI System
/dev/sda2 1026048 63940607 62914560 30G Linux filesystem
/dev/sda3 63940608 189769727 125829120 60G Linux filesystem
/dev/sda4 189769728 193964031 4194304 2G Linux filesystem
/dev/sda5 193964032 9767540735 9573576704 4.5T Linux filesystem

Please tell me how to install correctly. THanks.

Regards

Henry

Samuel Thibault <sthibault@debian.org> 於 2022年10月23日週日下午5:55寫道：
Henry Chang, le dim. 23 oct. 2022 17:54:03 -0400, a ecrit:
> What is the debian-accessibility mailing list?

Google would lead you to
https://lists.debian.org/debian-accessibility/

> Yes, I have tesseract installed. Please tell me how to use tesseract to
> transform a pdf file by bash commands. Thanks.

I have no idea how to do that, but the debian-accessibility list
probably knows.

Samuel