When clicking on ‘Places’ then ‘Computer’ in Ubuntu 6.06. The windows partitions which are automatically detected are not accessible, and you receive the following error:

Unable to mount the selected volume
error: device /dev/hda2 is not removable
error: could not execute pmount

This is because pmount is being used by the system instead of mount. pmount is used because it can be executed by normal users. However pmount is designed for removable media and only if the user has the permission to mount removable devices.

Non-removable devices can also be mounted if they are listed in the pmount.allow file.

So edit the file and add the device to the end of the file.

/etc/pmount.allow

Add your device, for instance:

/dev/sdb1

Then save the file.