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Ticket Resolution Summary Owner Reporter
#17360 fixed Cannot mount loop device from within shared folder on 5.2.x -> fixed in 6.0.6 thurask
Description

Host: Windows 10 Enterprise v1709 AMD64

Guest: Xubuntu 17.10 AMD64

On 5.2.2 r119230 and 5.2.3 r119552, attempting to mount an EXT4 partition image on the Linux guest stored in a shared folder on the Windows host fails with "mount: can't read superblock on /dev/loop0". 5.1.30 did not have this issue as far as I can remember.

With a new and up-to-date Xubuntu VM and Guest Additions installed:

$ cd /media/sf_SharedFolder
$ dd if=/dev/zero of=test.img bs=4k count=60000
$ sudo mkfs.ext4 test.img
$ mkdir testout
$ sudo mount -o loop test.img testout/
"mount: /media/sf_SharedFolder/testout: can't read superblock on /dev/loop0"

Doing the same thing on a folder inside the VM storage (like ~) correctly mounts the EXT4 image. The shared folder can be read from and written from within the VM as long as there's no loop mounting.

#3606 worksforme Cannot mount shared folders Jason
Description

This would appears to be a simple documentation fix (either the explanation needs fleshed out for new users, or the command simply needs changed).

The documentation states:

In a Linux guest, use the following command:
mount -t vboxsf [-o OPTIONS] sharename mountpoint

This does not work, you will get the following error

Only root can mount shared folders from the host.

Users need to be informed that they must be root (or have relevant admin rights) to do a mount. This simply means using "sudo" or "su" depending on your distro. When this is fixed, the command will still fail, but with a new error:

/sbin/mount.vboxsf: mounting failed with the error: Protocol error

To fix this, it seems you need to run a different command.

mount.vboxsf [-o OPTIONS] sharename mountpoint

This works.

I am not very familiar with Linux, so I am afraid I do not have the required knowledge to fully detail why this different command works, or how it may need to be issued on a different distribution (I used Ubuntu 8.10).

#7942 duplicate Cannot not start 64-bit Gentoo install CD on 32-bit Windows XP (VERR_EM_INTERNAL_ERROR) Plamen Petrov
Description

Trying to run 64-bit Gentoo on 32-bit Windows XP host fails, even although all prerequisites are met.

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