Ok, here is the scenario.
I have a bootable custom Ubuntu 22.04 install ISO that I copy to a USB thumb drive using dd and I'm able to install on a physical machine SSD using that thumb drive.
After the installer reboots the machine, I log in and using fdisk I do not see the thumb drive:
$ sudo fdisk -l
Disk /dev/loop0: 79.95 MiB, 83832832 bytes, 163736 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop1: 46.96 MiB, 49242112 bytes, 96176 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop2: 61.96 MiB, 64970752 bytes, 126896 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdb: 119.24 GiB, 128035676160 bytes, 250069680 sectors
Disk model: SPCC Solid State
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: AD72FCA6-2F49-48E3-93D9-01A94EE054A1
Device Start End Sectors Size Type
/dev/sdb1 2048 4095 2048 1M BIOS boot
/dev/sdb2 4096 4198399 4194304 2G Linux filesystem
/dev/sdb3 4198400 250066943 245868544 117.2G Linux filesystem
Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 58.62 GiB, 62939725824 bytes, 122929152 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
But it shows in lsusb:
admin@ihotel-staging:~$ lsusb
Bus 002 Device 004: ID 15d9:1133 Trust International B.V. SuperMicro LCD Display
Bus 002 Device 003: ID 1221:3234 Unknown manufacturer Disk (Thumb drive)
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0557:2221 ATEN International Co., Ltd Winbond Hermon
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
And in lsblk as sda:
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 79.9M 1 loop /snap/lxd/22923
loop1 7:1 0 47M 1 loop /snap/snapd/16292
loop2 7:2 0 62M 1 loop /snap/core20/1587
sda 8:0 1 0B 0 disk
sdb 8:16 0 119.2G 0 disk
├─sdb1 8:17 0 1M 0 part
├─sdb2 8:18 0 2G 0 part /boot
└─sdb3 8:19 0 117.2G 0 part
└─ubuntu--vg-ubuntu--lv 253:0 0 58.6G 0 lvm /
It looks like the boot process "unplugs" the thumb drive:
admin@ihotel-staging:~$ sudo dmesg -T | grep sda
[Wed Nov 9 15:24:41 2022] sd 0:0:0:0: [sda] Media removed, stopped polling
[Wed Nov 9 15:24:42 2022] sd 0:0:0:0: [sda] Attached SCSI removable disk
Same thing if I do a warm reboot or cold boot.
The only way to get the thumb drive to be available is to physically disconnect it and reconnect it to the USB port. And after doing so, it's always available after a ward reboot or cold boot...
dmesg when I physically disconnect and reconnect it:
[Wed Nov 9 15:50:22 2022] usb 2-1.2: USB disconnect, device number 3
[Wed Nov 9 15:50:26 2022] usb 2-1.2: new high-speed USB device number 5 using ehci-pci
[Wed Nov 9 15:50:27 2022] usb 2-1.2: New USB device found, idVendor=1221, idProduct=3234, bcdDevice= 0.00
[Wed Nov 9 15:50:27 2022] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[Wed Nov 9 15:50:27 2022] usb 2-1.2: Product: Flash Disk
[Wed Nov 9 15:50:27 2022] usb 2-1.2: Manufacturer: USB2.0
[Wed Nov 9 15:50:27 2022] usb 2-1.2: SerialNumber: WD00009162002034
[Wed Nov 9 15:50:27 2022] usb-storage 2-1.2:1.0: USB Mass Storage device detected
[Wed Nov 9 15:50:27 2022] scsi host0: usb-storage 2-1.2:1.0
[Wed Nov 9 15:50:28 2022] scsi 0:0:0:0: Direct-Access USB2.0 Flash Disk 2.b0 PQ: 0 ANSI: 2
[Wed Nov 9 15:50:28 2022] sd 0:0:0:0: Attached scsi generic sg0 type 0
[Wed Nov 9 15:50:28 2022] sd 0:0:0:0: [sda] 15974400 512-byte logical blocks: (8.18 GB/7.62 GiB)
[Wed Nov 9 15:50:28 2022] sd 0:0:0:0: [sda] Write Protect is off
[Wed Nov 9 15:50:28 2022] sd 0:0:0:0: [sda] Mode Sense: 0b 00 00 08
[Wed Nov 9 15:50:28 2022] sd 0:0:0:0: [sda] No Caching mode page found
[Wed Nov 9 15:50:28 2022] sd 0:0:0:0: [sda] Assuming drive cache: write through
[Wed Nov 9 15:50:28 2022] sda: sda1 sda2 sda3 sda4
[Wed Nov 9 15:50:28 2022] sd 0:0:0:0: [sda] Attached SCSI removable disk
fdisk -l after I physically disconnect and reconnect it:
$ sudo fdisk -l
Disk /dev/loop0: 61.96 MiB, 64970752 bytes, 126896 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop1: 79.95 MiB, 83832832 bytes, 163736 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop2: 46.96 MiB, 49242112 bytes, 96176 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdb: 119.24 GiB, 128035676160 bytes, 250069680 sectors
Disk model: SPCC Solid State
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: AD72FCA6-2F49-48E3-93D9-01A94EE054A1
Device Start End Sectors Size Type
/dev/sdb1 2048 4095 2048 1M BIOS boot
/dev/sdb2 4096 4198399 4194304 2G Linux filesystem
/dev/sdb3 4198400 250066943 245868544 117.2G Linux filesystem
Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 58.62 GiB, 62939725824 bytes, 122929152 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sda: 7.62 GiB, 8178892800 bytes, 15974400 sectors
Disk model: Flash Disk
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 0D2E9842-BEF5-4EB8-BD9E-048609496FAF
Device Start End Sectors Size Type
/dev/sda1 64 2923575 2923512 1.4G Microsoft basic data
/dev/sda2 2923576 2932071 8496 4.1M EFI System
/dev/sda3 2932072 2932671 600 300K Microsoft basic data
/dev/sda4 2932736 15974336 13041601 6.2G Linux filesystem
Any hints to get the drive recognized without having to physically disconnect and reconnect it ?
