Remedying "mounting failed" error after Ubuntu image upgrade

[Phrawm53]

For Ubuntu Linux 10.04 running under VirtualBox Windows 7.

As of 27 September, Ubuntu received an upgrade to Linux image / headers 2.6.32-25.44.

This upgrade broke my previously working shared folders. My previously working mount command produced errors of the form:

Code: Select all

/sbin/mount.vboxsf: mounting failed with the error: No such device

Running dmesg | grep vboxsf | less listed multiple (many!) errors of the form:

Code: Select all

[   50.956007] vboxsf: no symbol version for RTSemFastMutexCreate
[   50.956007] vboxsf: Unknown symbol RTSemFastMutexCreate
[   50.956007] vboxsf: no symbol version for VBoxGuestIDCCall
[   50.956007] vboxsf: Unknown symbol VBoxGuestIDCCall
[   50.956007] vboxsf: no symbol version for RTMemTmpFree
[   50.956007] vboxsf: Unknown symbol RTMemTmpFree
[   50.956007] vboxsf: no symbol version for RTErrConvertToErrn
...
...

The solution was to reinstall VirtualBox Guest Additions on the Ubuntu guest system. Doing so uninstalls the existing Guest Additions, then rebuilds and reinstalls it. At that point my mount command resumed working in 2.6.32.25-44.

Cheers & hope this helps,
Ric

[Perryg]

See Chapter 4.2.2.1. Installing the Linux Guest Additions in your VirtualBox users manual. Especially the part about dkms.