Question

3

Once mounted using TrueCrypt, cannot unmount

rated 0 times [ 3] [ 0] / answers: 1 / hits: 8481 / 2 Years ago, tue, november 1, 2022, 7:09:04

I have an external HDD and use TrueCrypt for keeping encrypted file containers.
After mounting, whenever I try to dismount a file container (using TrueCrypt 7.0a on Ubuntu 11.04), it just does not happen and I get the following message:

device-mapper: remove ioctl failed: Device or resource busy

Command failed

Further, if I close TrueCrypt and then try to start it again, it says that TrueCrypt is already running, but I cannot access it from the Unity sidebar (because it is not there).

Also, if I power down my external HDD, the TrueCrypt volume still shows as one of the mounted volumes, but I cannot do anything with it.

Any possible work around? I remember this NOT happening in earlier versions of Ubuntu so I am guessing there is something to do with 11.04.

Thanks

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

luringdge

Add To Favorites

Follow

Total Points: 3

Total Questions: 126

Total Answers: 109

Location: India

Member since Sun, Feb 6, 2022

2 Years ago

luringdge questions

1 Accidentally rejected nvidia-cudnn license install with apt, now I can't uninstall it

Sun, Oct 17, 21, 08:22, 3 Years ago

1 Trying to uncomment unattended-upgrades lines with script, need help

Fri, Dec 30, 22, 23:57, 1 Year ago

1 enable AMDGPU for R9 270x on 20.04

Sun, Oct 10, 21, 07:21, 3 Years ago

1 How to fix "GLib-GIO-ERROR Settings schema 'org.gtk.Settings.FileChooser' is not installed"?

Sun, Apr 16, 23, 13:31, 1 Year ago

1 Ping and web requests have slow "startup" yet DNS, latency and speed tests are fast?

Tue, May 4, 21, 08:02, 3 Years ago

View All

answered 2 Years ago gigglcept · Accepted Answer

This looks indeed like a problem in Natty. A work-around exists by unmounting the mount point (usually a directory in /media/) and then pressing the Unmount button in TrueCrypt. An example of the umount command (sudo is required):

sudo umount /media/truecrypt1

After further investigation, it seems that a NTFS formatted container that was created in Windows is affected.

Output of file -s on the mounted stuff:

A 99MB volume formatted NTFS which is causing issues:

/dev/mapper/truecrypt1: x86 boot sector, code offset 0x52, OEM-ID "NTFS ", sectors/cluster 8, reserved sectors 0, Media descriptor 0xf8, heads 1, dos < 4.0 BootSector (0x80)

A 99MB volume formatted FAT which works fine:

/dev/mapper/truecrypt1: x86 boot sector, code offset 0x3c, OEM-ID "MSDOS5.0", sectors/cluster 2, reserved sectors 36, Media descriptor 0xf8, heads 1, sectors 204288 (volumes > 32 MB) , FAT (32 bit), sectors/FAT 798, serial number 0xf30d2054, unlabeled
The output for EXT* filesystems are similar.