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I have a problem. I have had Ubuntu 12.04 on my laptop for 2 years and up until now no problems with the USB. But since this evening the pc doesn't mount the USB. I read some discussions but the problem persists. with

sudo fdisk -l

shows

    Disk /dev/sdb: 2003 MB, 2003828736 bytes
43 heads, 42 sectors/track, 2167 cylinders, total 3913728 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 identifier: 0x00095b2e

My USB has got fat32 filesystem:

enter image description here

And with a USB with ext4 filesystem,shows:

    Disk /dev/sdb: 31.5 GB, 31457280000 bytes
255 heads, 63 sectors/track, 3824 cylinders, total 61440000 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 identifier: 0x000eecfd

enter image description here So the Pc sees that the USB is connected but I don't see it in file directory. enter image description here

Where data is a partition of my SSD. whitsudo lsusb command:

Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 8644:8003

Where the last line is the 2GB USB I have Arduino and it works without problems. with the other pc in my house, with ubuntu too the USB are read perfectly. How can I solve my problem?

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  • Maybe the output of dmesg just after you try to connect the USB might help
    – clobrano
    Jan 9, 2016 at 16:39

2 Answers 2

Reset to default
0

The Mount Helper was disabled (I don't know why) enter image description here

Once abilitated, all works fine.

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Mount device/partition manually.

  1. Try:

    # mount -t ntfs /dev/sdb1

  2. If problem persists:

    # mkdir /media/$USER/USB1
# mount -t ntfs /dev/sdb1 /media/$USER/USB1

  3. You can try to mount a device/partition using UUID/LABEL of device/partition. Double-click on given device/partition in GParted to retrieve <uuid>. Then:

    # mount -t ntfs UUID=<uuid>

    or 

    # mount -t ntfs /dev/disk/by-uuid/<uuid>

    or

    # mount -t ntfs LABEL=<label>

    or 

    # mount -t ntfs /dev/disk/by-label/<label>

    3a. You can define mountpoint:

    # mount -t ntfs /dev/disk/by-uuid/<uuid> <mountpoint>
  4. If none doesn't lead to supposed result, use usb ammeter to check whether usb port is powered properly.

Further reading:

A. $ man mount

B. mount on ArchWiki.

C. mount(8) on die.net.

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  • Hi, thank you for the reply. With second command (with the mount point I can mount the USB, but I able to use it only with root permissions (I created a mountpoint in/media/USB_mount (where I have other mountpoint)). But my question is: why from a day to an other my PC doesn't mount USB automatically?
    – linofex
    Jan 9, 2016 at 9:41
  • I don't know why (maybe kernel problems). But I have found additional solution: sudo apt-get install usbmount. This thread on help.ubuntu.com might be also helpful for you.
    – Christianus
    Jan 9, 2016 at 9:51
  • with Disk application I see the USB and I can mount it without root access. Thanks for your help. Waiting for the answer about why not automatically mount.
    – linofex
    Jan 9, 2016 at 10:03

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