unable to mount pen drive on usb port; /dev/sdb missing
My Ubuntu 23.10 desktop behaved very strangely when i powered it on last evening (2024 May 05): It took about 20 minutes to boot. (I didn't mess with the system and did a normal shutdown in the morning of May 05.)
Since then I haven't been able to connect external memory (pen drive) because there isn't any /dev/sdb! There is only sda.
I browsed quite a few posts related to "sdb" but couldn't find any information i could use. In desperation (to debug and fix the problem) I ran several commands and saved their output:
lsusb
sudo lsblk
sudo parted -ls
usb-devices
partprobe
parted -l
sudo sfdisk -l
sudo dmesg | grep "ata\|scsi\|raid"
ls -al /sys/block/
sudo blkid
sudo dmesg
ls -al I am listing the output of just three commands here because i don't want to make this a "very long" post.
Today I upgraded to Ubuntu 24.04 LTS.
I'd be grateful if someone could help me find a solution.
Thank you.
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lsusb resulted in the following output:
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 006: ID 045e:00db Microsoft Corp. Natural Ergonomic Keyboard 4000 V1.0
Bus 001 Device 005: ID 046d:c077 Logitech, Inc. Mouse
Bus 001 Device 011: ID 214b:7250 Huasheng Electronics
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
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sudo lsblk resulted in the following output (i deleted many lines starting with "loop", in order to shorten this message):
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 4K 1 loop /snap/bare/5
loop1 7:1 0 93.3M 1 loop /snap/bitwarden/107
loop2 7:2 0 9.8M 1 loop /snap/canonical
loop3 7:3 0 93.3M 1 loop /snap/bitwarden/108
loop4 7:4 0 10.1M 1 loop /snap/canonical
loop5 7:5 0 105.4M 1 loop /snap/core/16574
loop13 7:13 0 66.1M 1 loop /snap/cups/1044
loop15 7:15 0 268.3M 1 loop /snap/firefox/4090
loop16 7:16 0 269.6M 1 loop /snap/firefox/4136
loop17 7:17 0 10.7M 1 loop /snap/firmware-
loop18 7:18 0 515.3M 1 loop /snap/gimp/418
loop19 7:19 0 10.7M 1 loop /snap/firmware-
loop20 7:20 0 515.3M 1 loop /snap/gimp/428
loop21 7:21 0 140.7M 1 loop /snap/gnome-
loop33 7:33 0 140K 1 loop /snap/gtk2-
loop40 7:40 0 17.8M 1 loop /snap/pdftk/9
loop41 7:41 0 184.5M 1 loop /snap/signal-
loop44 7:44 0 12.3M 1 loop /snap/snap-
loop46 7:46 0 452K 1 loop /snap/snapd-
sda 8:0 0 465.8G 0 disk
├─sda1 8:1 0 100M 0 part
├─sda2 8:2 0 22.4G 0 part
├─sda3 8:3 0 172.9G 0 part /mnt/a1bf4772-
├─sda4 8:4 0 1K 0 part
├─sda5 8:5 0 3.9G 0 part
├─sda6 8:6 0 19.5G 0 part
├─sda7 8:7 0 3.9G 0 part
├─sda8 8:8 0 171.9G 0 part
└─sda9 8:9 0 71.2G 0 part /var/snap/
sr0 11:0 1 1024M 0 rom
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lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 24.04 LTS
Release: 24.04
Codename: noble
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sudo dmesg produced a large output file; one of the lines in it is the following:
[ 1259.226903] /dev/sdb: Can't lookup blockdev
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- thiru ramakrishnan
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